Yella Terra

T R A C K

T E S T E D

S T R E E T

P R O V E N

HI PERFORMANCE ENGINE PARTS

VOL 1.17

ROLLER ROCKER APPLICATION GUIDE

OVER 50 YEARS of PERFORMANCE INNOVATION From humble beginnings in the early 1960’s “Dyno” Dave Bennett and his staff have built Yella Terra into Australia’s leading manufacturer of roller rockers, performance cylinder heads, superchargers and billet flywheels.

As a company, Yella Terra has always been committed to constant product improvement through motor sport involvement. From success in the early days of drag racing, to milestone developments in alloy head and roller rocker design proven over millions of trouble free race kilometers in Australian touring car and circle track racing.

The success of Yella Terra has not been restricted to Australia. Today, Yella Terra produce private label hi-performance engine parts for the USA, its totally unique roller rocker designs proving an instant success when released in the USA during the early 1980’s. In recent times, Yella Terra Platinum series race rockers have developed a dedicated following amongst US race engine builders.

Yella Terra’s expertise in product design and advanced CNC manufacturing techniques have earned the company a reputation as an efficient and reliable source for a large range of components required by the automotive and general industries.

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INDEX Rocker Arm Styles............................................................................................................................................ 4-5 Mounting Styles................................................................................................................................................. 6-7 Why Choose Yella Terra?.............................................................................................................................. 8-9 Application Guide

AMC V8......................................................................................................................................................... 10

BMC INLINE 4........................................................................................................................................... 10

BUICK V6..................................................................................................................................................... 11

BUICK V8..................................................................................................................................................... 10 CADILLAC V8 BIG BLOCK..................................................................................................................... 10

CHEVROLET V6........................................................................................................................................ 18 CHEVROLET V8 BIG BLOCK.......................................................................................................... 18-19

CHEVROLET V8 LS1, LS2, LS4, LS6............................................................................................ 15-16

CHEVROLET V8 LS3, LS9, LSA, L98............................................................................................ 16-17

CHEVROLET V8 LS7, LSX............................................................................................................... 17-18

CHEVROLET V8 SMALL BLOCK.................................................................................................. 12-14

CHEVROLET V8 SMALL BLOCK LT1................................................................................................. 11

CHRYSLER INLINE 6............................................................................................................................... 20 CHRYSLER V8 MOPAR............................................................................................................................ 20

FORD ESSEX V6........................................................................................................................................ 21

FORD INLINE 6.................................................................................................................................. 20-21

FORD V8 CLEVELAND & BIG BLOCK................................................................................................ 21 FORD V8 WINDSOR......................................................................................................................... 22-23

HOLDEN INLINE 4.................................................................................................................................. 26

HOLDEN INLINE 6.................................................................................................................................. 24

HOLDEN V6................................................................................................................................................ 11

HOLDEN V8......................................................................................................................................... 25-26

JEEP INLINE 4........................................................................................................................................... 26

JEEP V6........................................................................................................................................................ 26

NISSAN/DATSUN INLINE 4................................................................................................................. 26

OLDSMOBILE V8...................................................................................................................................... 27

PONTIAC V8............................................................................................................................................... 27

ROVER V8.................................................................................................................................................... 10

STUDEBAKER V8..................................................................................................................................... 28

VOLVO INLINE 4....................................................................................................................................... 27 Footnotes................................................................................................................................................................ 29 Mounting Hardware & Spares............................................................................................................. 30-33

YELLA TERRA | 3

ULTRALITE ULTRALITE PRO FACTORY REPLACEMENT/ STREET Late model V8 and V6 engines that run factory light weight valvetrain components are often subject to valve float in the upper RPM range, limiting the engines performance and full potential. Yella Terra’s engineering team set out to find a solution to the problem, and the result was the Ultralite.

Yella Terra’s exclusive Ultralite rocker arm, shaft and pedestal system offers 50% less nose weight than the factory rocker system, the result being greater RPM potential, with the added advantage of improved strength and durability. Also available in Ultralite Pro (widebody design).

MAX Open Spring Pressure: MAX spring diameter: Lifter Compatibility:

400lbs*, 480lbs* for Ultralite Pro 1.550” Hydraulic kits are designed specifically for use with hydraulic lifters. Adjustable kits are designed for use with both hydraulic and mechanical (solid) lifters.

STREET TERRA FACTORY REPLACEMENT / STREET The best value rocker arm on the market today. Engineered to meet or exceed the needs of performance street and sportsman race applications running a maximum open valve spring pressure of 450lb*.

Designed and engineered for optimum strength, the Street Terra vacuum die cast roller rocker features the extreme duty hardware from our premium Platinum series, including oversize ground trunnions and needle roller bearings, ensuring years of trouble free performance and durability.

No comparable product can claim this combination of critical features. Available in both traditional stud mount designs for use with pushrod guide plates and rocker studs, and our unique EASY FIT bolt-on sets that can be fitted in about one hour with no head removal or machining required. Street Terra EASY FIT kits are also a cost effective replacement for factory stamped steel rocker arms on standard or mild street engines.

MAX Open Spring Pressure: MAX spring diameter: Lifter Compatibility:

4 | YELLA TERRA

450lbs* 1.550” Hydraulic kits are designed specifically for use with hydraulic lifters. Adjustable kits are designed for use with both hydraulic and mechanical (solid) lifters.

PRO STREET STREET / STRIP Featuring aircraft grade, extruded aluminum rocker arms that will handle open spring pressures up to 600lbs*, the Pro Street range has been designed for use in high revving street/strip applications.

The Pro Street rocker arm is supported by the same hardware used in our severe race Platinum series, including massive ground trunnions that have been machined to accommodate oversize needle roller bearings. The ground finish on our trunnions offers smoother operation, lower friction and better bearing compatibility than the machined finish used with comparable products.

MAX Open Spring Pressure: MAX spring diameter: Lifter Compatibility:

600lbs* 1.550” Hydraulic kits are designed specifically for use with hydraulic lifters. Adjustable kits are designed for use with both hydraulic and mechanical (solid) lifters.

PLATINUM STRIP / RACE Some years ago, we set out to create the world’s strongest roller rocker, with the highest RPM potential, and the successful result was the Platinum series.

Engineered for the most severe race applications on the planet, Platinum rockers feature “wide body” arms for even greater strength and resistance to deflection. Capable of handling open spring pressures in excess of 900lbs, all platinum rockers feature heavy-duty 7/16” mountings for unsurpassed rocker stability.

Platinum rockers are available in twin shaft versions for parallel valve applications and unique single shaft designs for canted valve cylinder heads. The Platinum range covers most popular factory and aftermarket performance heads in a choice of ratios and offsets.

MAX Open Spring Pressure: MAX spring diameter: Lifter Compatibility:

900lbs* 1.550” Designed for use with both hydraulic and mechanical (solid) lifters.

*Listed spring pressures may vary depending on camshaft lobe intensity and lift.

YELLA TERRA | 5

STUD

YT 5010

Traditional stud mount rockers are designed to use either original or heavy duty screw in oversize studs when machining is required. Available in adjustable versions suitable for mechanical and hydraulic camshafts. Guide plates, hardened pushrods and stud girdles may be necessary with these rockers.

We highly recommend fitting shaft or pedestal mount designs where possible to eliminate these requirements.

SHAFT

YT 6640

No stud mount rocker arm can match the strength, rigidity, stiffness, or ability to take the rigorous punishment that a good quality shaft mount rocker arm can. When utilising higher spring pressures and/or popular rapid accelerating cam lobe profiles, a shaft mount rocker arm should be the only choice.

6 | YELLA TERRA

PEDESTAL

YT 6321

A truly unique rocker design - no other manufacturer offers such a simple to fit assembly. The design registered pedestal bolts directly to the original mounting holes and positively locks the trunnion in precise relationship to the valve stem. Provides an extremely rigid rocker, available in non adjustable versions for hydraulic camshafts only and adjustable versions for both mechanical and hydraulic camshafts.

MODULAR

YT 6743

The modular system is designed to replace the standard shaft type rockers on a variety of engines. There are a number of versions to suit specific engines some utilizing the standard shafts and hardware and others complete with CNC cradle, shafts, rockers and all necessary mounting hardware (pictured above).

YELLA TERRA | 7

WHY CHOOSE ROLLER ROCKERS? GREATER STRENGTH Our arms are infinitely REDUCED HEAT The reduction in friction that stronger than standard stamped steel arms providing the best resistance to bending and breaking under high spring pressures and/or radical cam profiles at high RPMs. Stamped steel rocker arms, in high performance applications, are prone to failure. A high rate of fulcrum wear, flexing, cracking, splitting, and breakage are common problems that will result in power loss or possible piston failure due to detonation of the incoming air/fuel charge.

roller rockers create has an additional benefit of reducing the operating temperature and foaming effect of engine oil to provide safe lubrication in high stress applications.

REDUCED VALVE SEAT WEAR The traditional

metal tip on standard rockers literally drags across the valve tip as the rocker opens and closes causing high side loading on the valve. This side ward force leads to irregular and rapid valve, valve guide and valve seat wear in many engines. The roller tip on Yella Terra and Street Terra roller rockers Other Yella Terra rocker components such as the eliminates this side loading action, as a result trunnions, polylocks and bearings greatly enhance engines rev quicker and freer with a crisp exhaust valvetrain durability in performance applications. note.

VARIOUS ROCKER ARM RATIO CHANGES VALVETRAIN ADJUSTMENT Use of high Higher ratio rockers produce more lift out of a given cam profile, lift the valve off the seat at a much faster rate than stock rockers to initiate and sustain increased airflow, and can also increase horsepower and torque.

Higher ratio rockers limit the lifter travel which reduces internal friction and lifter/pushrod inertia, which in turn can allow for the use of lighter valve springs due to the increased leverage effect of the high lift rocker arm upon closing the valve.

When changing rocker arm ratios on your engine to a higher ratio, not only does the gross valve lift increase, but the duration at the valve in the higher lift ranges also grows.

Benefits of this geometry include: • Increased flow into the cylinder earlier in the cycle • Quicker closing of the valve to trap cylinder pressure before combustion • More effective duration at .200” net valve lift, while maintaining a relatively short seat-toseat timing • Less required valve spring seat pressure because of the mechanical advantage of the higher seat ratio.

8 | YELLA TERRA

performance hydraulic or mechanical camshafts requires some form of valvetrain adjustment to achieve correct clearance and geometry. Adjustable roller rockers allow these corrections to be made quickly and easily.

VALVETRAIN STABILITY Yella Terra and Street

Terra EASY FIT shaft and pedestal designs offer the most rigid rocker system without using restraining devices such as guide plates, screw in studs and stud girdles. The result is more consistent valve lift and vastly improved valvetrain reliability at a substantially lower cost.

MORE POWER THROUGH LESS FRICTION

The use of needle roller bearings at the rocker fulcrum combined with a roller tip at the valve greatly reduces horsepower robbing friction in the valvetrain to provide a measurable power increase over standard systems.

WHY CHOOSE YELLA TERRA? AUSTRALIAN DEVELOPMENTS & SUCCESS WARRANTY Yella Terra warrants that, subject In 1982 Yella Terra recognised the need for a superior roller rocker and visualised a wider range of designs, and developed a totally new concept of the bolt-on rocker for the performance market, now called EASY FIT or EF. The new design eliminated the unnecessary cost that were attached to traditional set-ups. Yella Terra rockers are Australian made with USA sourced materials and components.

to the exclusion and limitations listed on the Yella Terra web page, the product will be free from defects in materials and workmanship for the duration of the applicable warranty period as specified on the warranty statement located on the www.yellaterra.com.au website. Yella Terra roller rockers carry a 12 month general warranty, plus limited lifetime warranty against breakage of extruded aluminum arms.

EASY FIT DESIGNS Designed by Yella Terra ANATOMY and imitated by manufacturers worldwide, these ingenious shaft and pedestal designs can be fitted in around 1 hour with no head removal or machining required. The EASY FIT rockers offer superior rigidity to stud type rockers thereby eliminating the need for expensive guide plates, hardened pushrods and stud girdles.

COMPONENT STRENGTH Yella Terra aircraft

2

1

9

5 3 6 quality extruded arms are matched to massive 8 4 ground trunnions for superior durability to other 7 brands. Oversize needle roller bearings are used for better load distribution and other hardware used feature materials and finish that ensure 1. Adjusting screw and lock nut reliability, minimum friction and long life.

2. Unique roller slot for adequate lubrication, specially machined to reduce stress MORE POWER & BETTER PERFORMANCE concentrations Aftermarket rockers provide significant power 3.

Roller of generous diameter from chrome increases. Higher ratio rockers lift the valve off moly steel hardened and ground the seat at a much faster rate than stock rockers to initiate and sustain increased airflow. Rather than 4. Roller pin positively retained by internal circlip hurting torque, lowering vacuum, and reducing idle quality, higher ratio rockers improve horsepower 5. Lightweight rocker with excellent balance and low inertia and torque. On average increases of 14HP and 12ft lbs torque are seen with factory ratio rocker 6. Torrington needle roller bearings full complement design, not cheap turned steel. replacement and 25HP and 20ft lbs with higher 7.

Clearance for large springs and large fillet ratio rockers. radius rocker studs 8.

Huge high strength trunnion or shaft, WORLD’S LARGEST RANGE Yella Terra precision ground from chrome moly steel to offers the largest range of rocker types and ratio bearing manufacturer’s specification combinations to suit more engine and cylinder 9.

Pushrod socket (not visible) provides metered head types and performance designs oil supply and directs oil to trunnion and roller slot.

SPARE PARTS SUPPORT Proudly Australian

made, Yella Terra rockers are supported by a full range of single units and spare parts to ensure your purchase will give service long into the future.

YELLA TERRA | 9

AMC V8 FACTORY HEAD • 304, 360, 390, 401 PART NO.

RATIO

SIZE

MOUNT TYPE

ADJUSTER

FOOTNOTE

ST 2010 YT 5010

1.65 HYD 1.65 HYD

7/16” 7/16”

STUD MOUNT STUD MOUNT

POLYLOCK POLYLOCK

2, 3, 5 2, 3, 5

SIZE 7/16” 7/16”

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT

ADJUSTER PUSHROD SCREW PUSHROD SCREW

FOOTNOTE 2, 3 2, 3

REQUIRES

FOOTNOTE EF, 5

REQUIRES

FOOTNOTE EF, 12

REQUIRES

FOOTNOTE EF, 12 EF, 12

REQUIRES

FOOTNOTE EF, 13 EF, 12

REQUIRES

FOOTNOTE EF, 12

REQUIRES

REQUIRES

HERMAN LEWIS PART NO. YT 6395 YT 6396

RATIO 1.6 ADJ 1.7 ADJ

EDELBROCK • AMC 343-401 V8 Performer RPM for NHRA stock /super stock PART NO. ST 2009

RATIO 1.65 HYD

SIZE 3/8”

MOUNT TYPE STUD MOUNT

ADJUSTER POLYLOCK

BMC INLINE 4 FACTORY HEAD • “A” SERIES: 850cc, 1275cc PART NO. YT 6347

RATIO 1.5 ADJ

SIZE MOUNT TYPE ADJUSTER 3/8” & 5/16” MODULAR SHAFT PUSHROD SCREW

• “B” SERIES: 1500cc, 1800cc PART NO. YT 6302 YT 6644

RATIO 1.5 ADJ 1.6 ADJ

SIZE 5/16” 5/16”

MOUNT TYPE ADJUSTER MODULAR SHAFT PUSHROD SCREW MODULAR SHAFT PUSHROD SCREW

BUICK/ROVER V8 FACTORY HEAD • (BOP) BUICK, OLDSMOBILE, PONTIAC: 215 - Small Block Engines (1961-1963) • ROVER/RANGE ROVER: 3.5 & 4.2 (3500cc - 4275cc) PART NO. YT 6000 YT 6305

RATIO 1.6 ADJ 1.6 ADJ

SIZE

MOUNT TYPE ADJUSTER ORIGINAL SHAFT PUSHROD SCREW MODULAR SHAFT PUSHROD SCREW

CADILLAC V8 BIG BLOCK FACTORY HEAD • 472, 500 PART NO. YT 6687

RATIO 1.75

10 | YELLA TERRA

SIZE 7/16”

MOUNT TYPE ADJUSTER MODULAR SHAFT PUSHROD SCREW

BUICK, HOLDEN V6 FACTORY HEAD • BUICK SERIES 1: 3800 231ci (to engine no. 1274842) (VN Series 1) PART NO. YT 6656 YT 6657

RATIO 1.7 HYD 1.8 HYD

SIZE 3/8” 3/8”

BRAND STREET TERRA ULTRALITE PRO STREET PLATINUM

MOUNT TYPE ADJUSTER PEDESTAL MOUNT HYDRAULIC PEDESTAL MOUNT HYDRAULIC

APPLICATION MAX OPEN SPRING PRESS. FACTORY REPLACEMENT/STREET <450lbs FACTORY REPLACEMENT/STREET <400lbs STREET / STRIP <600lbs RACE / STRIP <900lbs

FOOTNOTE EF EF

REQUIRES

• BUICK SERIES 1: 3800 231ci (From engine no. 1274843) (VN Series 2, VP, VR, VS Series 1) PART NO. YT 6658 YT 6659

RATIO 1.7 HYD 1.8 HYD

SIZE 5/16” 5/16”

MOUNT TYPE ADJUSTER PEDESTAL MOUNT HYDRAULIC PEDESTAL MOUNT HYDRAULIC

FOOTNOTE EF EF

REQUIRES

• BUICK SERIES 2 : L32, L36, L67 (Supercharged and N/A engines) (VS Series 2, VT, VX, VY) PART NO. YT 6669 YT 6649 YT 6650 YT 6661 YT 6651 YT 6662 YT 6666 YT 6361 YT 6307 YT 6333

RATIO 1.6 HYD 1.7 HYD 1.8 HYD 1.84 HYD 1.9 HYD 1.95 HYD 1.95/1.9 HYD 1.6 ADJ 1.65 ADJ 1.7 ADJ

SIZE 5/16” 5/16” 5/16” 5/16” 5/16” 5/16” 5/16” 7/16” 7/16” 7/16”

MOUNT TYPE PEDESTAL MOUNT PEDESTAL MOUNT PEDESTAL MOUNT PEDESTAL MOUNT PEDESTAL MOUNT PEDESTAL MOUNT PEDESTAL MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE EF, 14 EF, 14 EF, 14 EF, 14 EF, 14 EF, 14 EF, 14 3 3 3

REQUIRES

CHEV V8 SMALL BLOCK LT1 CENTER BOLT FACTORY HEAD PART NO. YT 6672 YT 6608

RATIO 1.5 1.6

SIZE 3/8” 3/8”

MOUNT TYPE STUD MOUNT STUD MOUNT

ADJUSTER

FOOTNOTE EF, 5, 21 EF, 5, 21

REQUIRES

AFTERMARKET HEADS with factory valvetrain geometry • DART: Pro1 LT1 PART NO. YT 6672 YT 6608

• LINGENFELTER (LPE): LT1

RATIO 1.5 1.6

SIZE 3/8” 3/8”

MOUNT TYPE STUD MOUNT STUD MOUNT

• EDELBROCK: LT1 ADJUSTER

FOOTNOTE EF, 5, 21 EF, 5, 21

REQUIRES

AIR FLOW RESEARCH • LT Eliminator 227 PART NO. YT 5001 YT 5002 YT 6703 YT 6704 YT 6705 YT 6706

RATIO SIZE 1.5 HYD 7/16” 1.6 HYD 7/16” 1.5x1.5 ADJ 7/16” 1.6x1.6 ADJ 7/16” 1.65x1.55 ADJ 7/16” 1.6x1.5 ADJ 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER POLYLOCK POLYLOCK PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE 2, 3, 5 2, 3, 5 2, 3, 6 2, 3, 6 2, 3, 6 2, 3, 6

• LT Eliminator 180, 195, 210, 220 PART NO. YT 5001 YT 5002 YT 6688 YT 6689 YT 6694 YT 6695 YT 6696

RATIO 1.5 HYD 1.6 HYD 1.5 ADJ 1.6 ADJ 1.6x1.5 ADJ 1.5 ADJ 1.6 ADJ

SIZE 7/16” 7/16” 7/16” 7/16” 7/16” 7/16” 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER POLYLOCK POLYLOCK HYDRAULIC HYDRAULIC PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE 2, 3, 5 2, 3, 5 2, 3, 6 2, 3, 6 2, 3, 6 2, 3, 6 2, 3, 6

(1.770 stud centers 60/40 valve spacing) REQUIRES

(1.810” stud centers)

REQUIRES

YELLA TERRA | 11

CHEV V8 SMALL BLOCK FACTORY HEAD • SMALL BLOCK: 265, 267, 283, 302, 305, 307, 327, 350, 400 PART NO. ST 2000 ST 2004 ST 2001 ST 2005 YT 5000 YT 5019 YT 5023 YT 5001 YT 5002 YT 6301 YT 6008 YT 6009 YT 6341 YT 6613 YT 6355 YT 6356 YT 6357

RATIO 1.5 HYD 1.6 HYD 1.5 HYD 1.6 HYD 1.5 HYD 1.6 HYD 1.5x1.6 HYD 1.5 HYD 1.6 HYD 1.65 HYD 1.55x1.55 ADJ 1.6 ADJ 1.6x1.5 ADJ 1.65x1.55 ADJ 1.5 ADJ 1.6 ADJ 1.65x1.55 ADJ

SIZE 3/8” 3/8” 7/16“ 7/16” 3/8” 3/8” 3/8” 7/16” 7/16” 7/16” 7/16” 7/16” 7/16” 7/16” 7/16” 7/16” 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT STUD MOUNT STUD MOUNT STUD MOUNT STUD MOUNT STUD MOUNT STUD MOUNT STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER POLYLOCK POLYLOCK POLYLOCK POLYLOCK POLYLOCK POLYLOCK POLYLOCK POLYLOCK POLYLOCK POLYLOCK PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE EF, 5 EF, 5 2, 3, 5 2, 3, 5 EF, 5 EF, 5 EF, 5 2, 3, 5 2, 3, 5 2, 3, 5 2, 3, 6 2, 3, 6 2, 3, 6 2, 3, 6 2, 3, 6 2, 3, 6 2, 3, 6

(1.770 stud centers)

REQUIRES

.150” offset inlet (wide port)

AFTERMARKET HEADS with factory valvetrain geometry • ALLPRO: 215 23° • BRODIX: Track 1 • BOWTIE: Iron & Alloy 23° • DART: II, Iron Eagle 23° PART NO. ST 2000 ST 2004 ST 2001 ST 2005 YT 5000 YT 5019 YT 5023 YT 5001 YT 5002 YT 6301 YT 6008 YT 6009 YT 6341 YT 6613 YT 6355 YT 6356 YT 6357

RATIO 1.5 HYD 1.6 HYD 1.5 HYD 1.6 HYD 1.5 HYD 1.6 HYD 1.5x1.6 HYD 1.5 HYD 1.6 HYD 1.65 HYD 1.55x1.55 ADJ 1.6 ADJ 1.6x1.5 ADJ 1.65x1.55 ADJ 1.5 ADJ 1.6 ADJ 1.65x1.55 ADJ

SIZE 3/8” 3/8” 7/16“ 7/16” 3/8” 3/8” 3/8” 7/16” 7/16” 7/16” 7/16” 7/16” 7/16” 7/16” 7/16” 7/16” 7/16”

• EDELBROCK: Victor Jnr. (1.770 stud centers) • PRO TOPLINE (RHS) • WORLD: Sportsman II, Conquest, S/R Torquer 305

MOUNT TYPE STUD MOUNT STUD MOUNT STUD MOUNT STUD MOUNT STUD MOUNT STUD MOUNT STUD MOUNT STUD MOUNT STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER POLYLOCK POLYLOCK POLYLOCK POLYLOCK POLYLOCK POLYLOCK POLYLOCK POLYLOCK POLYLOCK POLYLOCK PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE EF, 5 EF, 5 2, 3, 5 2, 3, 5 EF, 5 EF, 5 EF, 5 2, 3, 5 2, 3, 5 2, 3, 5 2, 3, 6 2, 3, 6 2, 3, 6 2, 3, 6 2, 3, 6 2, 3, 6 2, 3, 6

REQUIRES

.150” offset inlet (wide port)

AIR FLOW RESEARCH • 180, 195, 210 23° Original (Pre Eliminator) PART NO. YT 6618 YT 6619

RATIO 1.55x1.55 ADJ 1.65x1.55 ADJ

SIZE 7/16” 7/16”

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT

ADJUSTER PUSHROD SCREW PUSHROD SCREW

FOOTNOTE 2, 3, 6 2, 3, 6

REQUIRES .274” offset inlet .274” offset inlet

• 220, 225 Original (Pre Eliminator) PART NO. YT 6326 YT 6327 YT 6343

RATIO 1.55 ADJ 1.6x1.5 ADJ 1.65x1.55 ADJ

SIZE 7/16” 7/16” 7/16”

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE 2, 3, 6 2, 3, 6 2, 3, 6

RATIO 1.5 HYD 1.6 HYD 1.5 ADJ 1.6x1.5 ADJ 1.65x1.55 ADJ

12 | YELLA TERRA

SIZE 7/16” 7/16” 7/16” 7/16” 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER POLYLOCK POLYLOCK PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE 2, 3, 5 2, 3, 5 2, 3, 6 2, 3, 6 2, 3, 6

(1.770” stud centers)

REQUIRES .265” offset inlet .265” offset inlet .265” offset inlet

• 227 23° Original (Pre Eliminator) PART NO. YT 5001 YT 5002 YT 6615 YT 6616 YT 6617

(1.770” stud centers)

REQUIRES

.206” offset inlet .206” offset inlet .206” offset inlet

(1.770” stud centers)

• Eliminator 180, 195, 210, 220 PART NO. YT 5001 YT 5002 YT 6688 YT 6689 YT 6694 YT 6695 YT 6696

RATIO 1.5 HYD 1.6 HYD 1.5 ADJ 1.6 ADJ 1.6x1.5 ADJ 1.5 ADJ 1.6 ADJ

(1.810” stud centers)

SIZE 7/16” 7/16” 7/16” 7/16” 7/16” 7/16” 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

BRAND STREET TERRA PRO STREET PLATINUM

ADJUSTER POLYLOCK POLYLOCK HYDRAULIC HYDRAULIC PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

• Eliminator 227, 235 PART NO. YT 5001 YT 5002 YT 6703 YT 6704 YT 6705 YT 6706

RATIO SIZE 1.5 HYD 7/16” 1.6 HYD 7/16” 1.5x1.5 ADJ 7/16” 1.6x1.6 ADJ 7/16” 1.65x1.55 ADJ 7/16” 1.6x1.5 ADJ 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER POLYLOCK POLYLOCK PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

APPLICATION MAX OPEN SPRING PRESS. FACTORY REPLACEMENT/STREET <450lbs STREET / STRIP <600lbs RACE / STRIP <900lbs

FOOTNOTE 2, 3, 5 2, 3, 5 2, 3, 6 2, 3, 6 2, 3, 6 2, 3, 6 2, 3, 6

FOOTNOTE 2, 3, 5 2, 3, 5 2, 3, 6 2, 3, 6 2, 3, 6 2, 3, 6

REQUIRES

(1.770 stud centers 60/40 valve spacing) REQUIRES

BOWTIE • Alloy 23° PART NO. YT 6308 YT 6325 YT 6338

RATIO 1.55 ADJ 1.6 ADJ 1.6x1.5 ADJ

SIZE 7/16” 7/16” 7/16”

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

• 23° SBC 10051101 PART NO. YT 6694 YT 6695 YT 6696

RATIO 1.6x1.5 ADJ 1.5 ADJ 1.6 ADJ

SIZE 7/16” 7/16” 7/16”

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

FOOTNOTE 2, 3, 6 2, 3, 6 2, 3, 6

(1.810” stud centers)

REQUIRES

ADJUSTER PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE 2, 3, 6 2, 3, 6 2, 3, 6

(1.810” stud centers)

REQUIRES

BRODIX • -8, -10x, -11 PART NO. YT 6308 YT 6325 YT 6338

RATIO 1.55 ADJ 1.6 ADJ 1.6x1.5 ADJ

SIZE 7/16” 7/16” 7/16”

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE 2, 3, 6 2, 3, 6 2, 3, 6

REQUIRES

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT

ADJUSTER PUSHROD SCREW PUSHROD SCREW

FOOTNOTE 2, 3, 6 2, 3, 6

REQUIRES

(1.810” stud centers)

• 18X PART NO. YT 6315 YT 6316

RATIO 1.5x1.5 ADJ 1.6x1.5 ADJ

SIZE 7/16” 7/16”

BROWNFIELD & CANFIELD • BROWNFIELD: 195 • CANFIELD: Avenger PART NO. YT 6326 YT 6327 YT 6343

RATIO 1.55 ADJ 1.6x1.5 ADJ 1.65x1.55 ADJ

SIZE 7/16” 7/16” 7/16”

(1.770 stud centers)

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE 2, 3, 6 2, 3, 6 2, 3, 6

REQUIRES .265” offset inlet .265” offset inlet .265” offset inlet

MOUNT TYPE SHAFT MOUNT

ADJUSTER PUSHROD SCREW

FOOTNOTE 2, 3, 6

REQUIRES .276” offset inlet

DART • 220 23° PART NO. YT 6622

RATIO 1.6x1.5 ADJ

SIZE 7/16”

YELLA TERRA | 13

CHEV V8 SMALL BLOCK (CONTINUED) DART • PRO 1 23° PART NO. YT 5001 YT 5002 YT 6035 YT 6620 YT 6621 YT 6623

RATIO SIZE 1.5 HYD 7/16” 1.6 HYD 7/16” 1.55x1.66 ADJ 7/16” 1.5 ADJ 7/16” 1.6x1.5 ADJ 7/16” 1.6 ADJ 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER POLYLOCK POLYLOCK PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE 2, 3, 5 2, 3, 5 2, 3, 6 2, 3, 6 2, 3, 6 2, 3, 6

(1.770” stud centers)

REQUIRES .158” offset inlet .158” offset inlet .158” offset inlet .158” offset inlet

PONTIAC MOTORSPORTS • 10045434 & 10033867 (semi finished pushrod holes suit offset rocker arms) PART NO. YT 6342 YT 6340

RATIO 1.6x1.5 ADJ 1.6 ADJ

SIZE 7/16” 7/16”

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT

ADJUSTER PUSHROD SCREW PUSHROD SCREW

FOOTNOTE 2, 3, 6 2, 3, 6

(1.810” stud centers)

REQUIRES .276” offset inlet .276” offset inlet

• 867 NASCAR 23° PART NO. YT 6308 YT 6325 YT 6338

RATIO 1.55 ADJ 1.6 ADJ 1.6x1.5 ADJ

SIZE 7/16” 7/16” 7/16”

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE 2, 3, 6 2, 3, 6 2, 3, 6

(1.810” stud centers)

REQUIRES

PROFILER • All American 23° 176 PART NO. YT 6342 YT 6340

RATIO 1.6x1.5 ADJ 1.6 ADJ

SIZE 7/16” 7/16”

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT

ADJUSTER PUSHROD SCREW PUSHROD SCREW

FOOTNOTE 2, 3, 6 2, 3, 6

(1.810” stud centers)

REQUIRES .276” offset inlet .276” offset inlet

RACER PRO • RP216 (standard port) PART NO. YT 6308 YT 6325 YT 6338

RATIO 1.55 ADJ 1.6 ADJ 1.6x1.5 ADJ

SIZE 7/16” 7/16” 7/16”

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE 2, 3, 6 2, 3, 6 2, 3, 6

REQUIRES

• RP216RI (raised inlet, no pushrod slots suit offset rocker arms) PART NO. YT 6342 YT 6340

RATIO 1.6x1.5 ADJ 1.6 ADJ

SIZE 7/16” 7/16”

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT

• RP23° CNC PART NO. YT 6757

RATIO 1.6 ADJ

SIZE 7/16”

ADJUSTER PUSHROD SCREW PUSHROD SCREW

FOOTNOTE 2, 3, 6 2, 3, 6

(1.810” stud centers)

(1.810” stud centers)

REQUIRES .276” offset inlet .276” offset inlet

MOUNT TYPE SHAFT MOUNT

ADJUSTER PUSHROD SCREW

FOOTNOTE 2, 3, 6

REQUIRES

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE 2, 3, 6 2, 3, 6 2, 3, 6

REQUIRES

(1.810” stud centers)

TRICKFLOW • Twisted Wedge PART NO. YT 6355 YT 6356 YT 6357

RATIO 1.5 ADJ 1.6x1.5 ADJ 1.5x1.6 ADJ

SIZE 7/16” 7/16” 7/16”

WORLD PRODUCTS • Motown, Hardcore PART NO. RATIO YT 6326 1.55 ADJ YT 6327 1.6x1.5 ADJ YT 6343 1.65x1.55 ADJ 14 | YELLA TERRA

SIZE 7/16” 7/16” 7/16”

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE 2, 3, 6 2, 3, 6 2, 3, 6

REQUIRES .265” offset inlet .265” offset inlet .265” offset inlet

(1.770 stud centers)

CHEV V8 LS1, LS2

BRAND ULTRALITE ULTRALITE PRO PRO STREET PLATINUM

ALSO SUIT CHEV V8 : • LS4 • LS6 • LM7 • LQ4 • LQ9 • LMG • L99 • LR4 • LY5

APPLICATION MAX OPEN SPRING PRESS. FACTORY REPLACEMENT/STREET <400lbs FACTORY REPLACEMENT/STREET <480lbs STREET / STRIP <600lbs RACE / STRIP <900lbs

FACTORY HEAD PART NO. YT 6645 YT 6646 YT 6647 YT 6721 YT 6722 YT 6723 YT 6721-M10 YT 6722-M10 YT 6723-M10 YT 6683 YT 6684 YT 6683-M10 YT 6684-M10 YT 6640 YT 6648 YT 6640-M10 YT 6648-M10

RATIO 1.7 HYD 1.8 HYD 1.8x1.7 HYD 1.7 HYD 1.8 HYD 1.7x1.8 HYD 1.7 HYD 1.8 HYD 1.7x1.8 HYD 1.7 ADJ 1.8 ADJ 1.7 ADJ 1.8 ADJ 1.7 ADJ 1.8 ADJ 1.7 ADJ 1.8 ADJ

SIZE 8.0mm 8.0mm 8.0mm 8.0mm 8.0mm 8.0mm 10.0mm 10.0mm 10.0mm 8.0mm 8.0mm 10.0mm 10.0mm 7/16” 7/16” 10.0mm 10.0mm

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE EF, 6, 7 EF, 6, 7 EF, 6, 7 EF, 6, 7 EF, 6, 7 EF, 6, 7 2, 4, 6, 7 2, 4, 6, 7 2, 4, 6, 7 EF, 6, 8 EF, 6, 8 2, 4, 6, 8 2, 4, 6, 8 2, 4, 6, 8 2, 4, 6, 8 2, 4, 6, 8 2, 4, 6, 8

REQUIRES

AFTERMARKET HEADS with factory valvetrain geometry • AFR • DART: 205, 255 PART NO. YT 6645 YT 6646 YT 6647 YT 6721 YT 6722 YT 6723 YT 6721-M10 YT 6722-M10 YT 6723-M10 YT 6683 YT 6684 YT 6683-M10 YT 6684-M10 YT 6640 YT 6648 YT 6640-M10 YT 6648-M10

• TFS: 215 • EDELBROCK

RATIO 1.7 HYD 1.8 HYD 1.8x1.7 HYD 1.7 HYD 1.8 HYD 1.7x1.8 HYD 1.7 HYD 1.8 HYD 1.7x1.8 HYD 1.7 ADJ 1.8 ADJ 1.7 ADJ 1.8 ADJ 1.7 ADJ 1.8 ADJ 1.7 ADJ 1.8 ADJ

• WORLD PRODUCTS

SIZE 8.0mm 8.0mm 8.0mm 8.0mm 8.0mm 8.0mm 10.0mm 10.0mm 10.0mm 8.0mm 8.0mm 10.0mm 10.0mm 7/16” 7/16” 10.0mm 10.0mm

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE EF, 6, 7 EF, 6, 7 EF, 6, 7 EF, 6, 7 EF, 6, 7 EF, 6, 7 2, 4, 6, 7 2, 4, 6, 7 2, 4, 6, 7 EF, 6, 8 EF, 6, 8 2, 4, 6, 8 2, 4, 6, 8 2, 4, 6, 8 2, 4, 6, 8 2, 4, 6, 8 2, 4, 6, 8

REQUIRES

SIZE 8.0mm 8.0mm 8.0mm 8.0mm 10.0mm 10.0mm 8.0mm 8.0mm 10.0mm 10.0mm

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE EF, 6, 7 EF, 6, 7 EF, 6, 7 EF, 6, 7 2, 4, 7 2, 4, 7 EF, 6, 8 EF, 6, 8 2, 4, 6, 8 2, 4, 6, 8

REQUIRES

TRICKFLOW • Gen X 215cc, 225cc, 235cc PART NO. YT 6731 YT 6732 YT 6727 YT 6728 YT 6727-M10 YT 6728-M10 YT 6735 YT 6736 YT 6739-M10 YT 6740-M10

RATIO 1.7 HYD 1.8 HYD 1.7 HYD 1.8 HYD 1.7 HYD 1.8 HYD 1.7 ADJ 1.8 ADJ 1.7 ADJ 1.8 ADJ

YELLA TERRA | 15

CHEV V8 LS1, LS2 SERIES (CONTINUED) MAST • 510-223/323 PART NO. YT 6675

RATIO 1.7 ADJ

SIZE 8.0mm

MOUNT TYPE SHAFT MOUNT

ADJUSTER PUSHROD SCREW

FOOTNOTE EF, 6, 7

REQUIRES

SIZE 8.0mm

MOUNT TYPE SHAFT MOUNT

ADJUSTER PUSHROD SCREW

FOOTNOTE EF, 6, 7

REQUIRES

• 510-220/320, 510-221/321 PART NO. YT 6677

RATIO 1.7 ADJ

CHEV V8 LS3, LS9, LSA, L98 SERIES ALSO SUIT CHEVROLET/GMC LS SERIE TRUCKS: L76, L77, LY6, L92, L94, L96, LC8, LC9, LH9, LMF, LH9 FACTORY HEAD PART NO. YT 6667 YT 6668 YT 6685 YT 6724 YT 6725 YT 6726 YT 6724-M10 YT 6725-M10 YT 6726-M10 YT 6653 YT 6654 YT 6655 YT 6653-M10 YT 6654-M10 YT 6682 YT 6686 YT 6682-M10 YT 6686-M10

RATIO 1.7 HYD 1.8 HYD 1.85 HYD 1.7 HYD 1.8 HYD 1.85 HYD 1.7 HYD 1.8 HYD 1.85 HYD 1.7 ADJ 1.8 ADJ 1.8x1.7 ADJ 1.7 ADJ 1.8 ADJ 1.7 ADJ 1.8 ADJ 1.7 ADJ 1.8 ADJ

SIZE 8.0mm 8.0mm 8.0mm 8.0mm 8.0mm 8.0mm 10.0mm 10.0mm 10.0mm 8.0mm 8.0mm 8.0mm 10.0mm 10.0mm 7/16” 7/16” 10.0mm 10.0mm

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE EF, 6, 22 EF, 6, 22 EF, 6, 22 EF, 6, 22 EF, 6, 22 EF, 6, 7 2, 4, 6, 7 2, 4, 6, 7 2, 4, 6, 7 EF, 6, 8 EF, 6, 8 EF, 6, 8 2, 4, 6, 8 2, 4, 6, 8 2, 3, 6, 8 2, 3, 6, 8 2, 4, 6, 8 2, 4, 6, 8

REQUIRES

AFTERMARKET HEADS with factory valvetrain geometry • GMPP CNC: 5364 Casting • LPE CNC: 823 Casting PART NO. YT 6667 YT 6668 YT 6685 YT 6724 YT 6725 YT 6726 YT 6724-M10 YT 6725-M10 YT 6726-M10 YT 6653 YT 6654 YT 6655 YT 6653-M10 YT 6654-M10 YT 6682 YT 6686 YT 6682-M10 YT 6686-M10

RATIO 1.7 HYD 1.8 HYD 1.85 HYD 1.7 HYD 1.8 HYD 1.85 HYD 1.7 HYD 1.8 HYD 1.85 HYD 1.7 ADJ 1.8 ADJ 1.8x1.7 ADJ 1.7 ADJ 1.8 ADJ 1.7 ADJ 1.8 ADJ 1.7 ADJ 1.8 ADJ

16 | YELLA TERRA

• SDPC CNC LS3/L92: 0821 Casting • TEA CNC LS3/L92: 823 Casting SIZE 8.0mm 8.0mm 8.0mm 8.0mm 8.0mm 8.0mm 10.0mm 10.0mm 10.0mm 8.0mm 8.0mm 8.0mm 10.0mm 10.0mm 7/16” 7/16” 10.0mm 10.0mm

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE EF, 6, 22 EF, 6, 22 EF, 6, 22 EF, 6, 22 EF, 6, 22 EF, 6, 7 2, 4, 6, 7 2, 4, 6, 7 2, 4, 6, 7 EF, 6, 8 EF, 6, 8 EF, 6, 8 2, 4, 6, 8 2, 4, 6, 8 2, 3, 6, 8 2, 3, 6, 8 2, 4, 6, 8 2, 4, 6, 8

REQUIRES

BRAND ULTRALITE ULTRALITE PRO PRO STREET PLATINUM

GM PERFORMANCE • No. 19201805 PART NO. YT 6752 YT 6753

RATIO 1.7 1.8

APPLICATION MAX OPEN SPRING PRESS. FACTORY REPLACEMENT/STREET <400lbs FACTORY REPLACEMENT/STREET <480lbs STREET / STRIP <600lbs RACE / STRIP <900lbs

SIZE 8.0mm 8.0mm

MOUNT TYPE SHAFT TYPE SHAFT TYPE

ADJUSTER HYDRAULIC HYDRAULIC

FOOTNOTE EF, 6, 22 EF, 6, 22

REQUIRES

SIZE 8.0mm 8.0mm 8.0mm

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER HYDRAULIC HYDRAULIC HYDRAULIC

FOOTNOTE EF, 6, 22 EF, 6, 8 EF, 6, 8

REQUIRES

SIZE 8.0mm 8.0mm 8.0mm

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER HYDRAULIC PUSHROD SCREW PUSHROD SCREW

FOOTNOTE EF, 6, 22 EF, 6, 8 EF, 6, 8

REQUIRES

RATIO 1.8 ADJ

SIZE 8.0mm

MOUNT TYPE SHAFT MOUNT

ADJUSTER PUSHROD SCREW

FOOTNOTE EF, 6, 8

REQUIRES

RATIO 1.7 HYD 1.8 HYD 1.7 HYD 1.8 HYD 1.7 HYD 1.8 HYD 1.7 ADJ 1.8 ADJ 1.7 ADJ 1.8 ADJ

SIZE 8.0mm 8.0mm 8.0mm 8.0mm 10.0mm 10.0mm 8.0mm 8.0mm 10.0mm 10.0mm

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE EF, 6, 22 EF, 6, 22 EF, 6, 22 EF, 6, 22 2, 4, 6, 7 2, 4, 6, 7 EF, 6, 8 EF, 6, 8 2, 4, 6, 8 2, 4, 6, 8

REQUIRES

FOOTNOTE EF, 6, 22, 26 EF, 6, 22, 26 EF, 6, 22, 26 EF, 6, 22, 26 EF, 6, 8, 26 EF, 6, 8, 27 EF, 5, 8, 15, 26 2, 4, 6, 8 2, 4, 6, 8 25 2, 3, 6, 8 2, 3, 6, 8 2, 4, 6, 8 2, 4, 6, 8 2, 4, 6, 8

REQUIRES

MAST • 510-301 (3.890”+ Bore) 240cc PART NO. YT 6679 YT 6747 YT 6749

RATIO 1.7 HYD 1.7 HYD 1.8 ADJ

• 510-303 (4.000”+ Bore) 255cc PART NO. YT 6680 YT 6748 YT 6681

RATIO 1.7 HYD 1.7 ADJ 1.8 ADJ

• 510-304 (4.125”+ Bore) 280cc PART NO. YT 6676 TRICKFLOW • Gen X 255cc PART NO. YT 6733 YT 6734 YT 6729 YT 6730 YT 6729-M10 YT 6730-M10 YT 6737 YT 6738 YT 6741-M10 YT 6742-M10

CHEV V8 LS7, LSX SERIES FACTORY HEAD PART NO. YT 6670 YT 6670A YT 6690 YT 6690A YT 6699A YT 6691B YT 6717A YT 6691-M10 YT 6693-M10 YT 6691-JS YT 6697 YT 6698 YT 6718-M10 YT 6697-M10 YT 6698-M10

RATIO 1.8 HYD 1.8 HYD 1.9 HYD 1.9 HYD 1.8 ADJ 1.8 ADJ 1.9 ADJ 1.8 ADJ 1.9 ADJ 1.8 ADJ 1.8 ADJ 1.9 ADJ 1.8 ADJ 1.8 ADJ 1.9 ADJ

SIZE 8.0mm 8.0mm 8.0mm 8.0mm 8.0mm 8.0mm 8.0mm 10.0mm 10.0mm

7/16” 7/16” 10.0mm 10.0mm 10.0mm

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER HYDRAULIC HYDRAULIC HYDRAULIC HYDRAULIC PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

YELLA TERRA | 17

CHEVROLET V8 LS7, LSX SERIES (CONTINUED) MAMO MOTORSPORTS • MMS-LS7 PART NO. YT 6754 YT 6750

RATIO 1.8 HYD 1.8 ADJ

SIZE 8.0mm 8.0mm

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT

ADJUSTER PUSHROD SCREW PUSHROD SCREW

FOOTNOTE EF, 6, 7 EF, 6, 8, 27

REQUIRES

SIZE 8.0mm

MOUNT TYPE SHAFT MOUNT

ADJUSTER PUSHROD SCREW

FOOTNOTE EF, 6, 8

REQUIRES

MAST • 510-306 (4.000”+ Bore) 265cc PART NO. YT 6673

RATIO 1.8 ADJ

• 510-307/309 (4.125”+ Bore) 285, 305cc PART NO. YT 6676

RATIO 1.8 ADJ

SIZE 8.0mm

MOUNT TYPE SHAFT MOUNT

ADJUSTER PUSHROD SCREW

FOOTNOTE EF, 6, 8

REQUIRES

RATIO 1.8 HYD 1.8 ADJ

SIZE 8.0mm 8.0mm

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT

ADJUSTER PUSHROD SCREW PUSHROD SCREW

FOOTNOTE EF, 6, 7 EF, 6, 8, 27

REQUIRES

MOUNT TYPE STUD MOUNT

ADJUSTER

FOOTNOTE EF, 5, 21

REQUIRES

TRICKFLOW • Gen X 260cc PART NO. YT 6754 YT 6750

CHEVROLET V6 FACTORY HEAD L35: 4.3L (1992-1995) PART NO. YT 6678

RATIO 1.6

SIZE 3/8”

CHEVROLET V8 BIG BLOCK FACTORY HEAD FACTORY IRON: 396, 402, 427, 454 PART NO. ST 2003 YT 5003 YT 5013 YT 6317 YT 6318 YT 6319

RATIO 1.7 HYD 1.7 HYD 1.8 HYD 1.7 ADJ 1.75 ADJ 1.8 ADJ

SIZE 7/16” 7/16” 7/16” 7/16” 7/16” 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER POLYLOCK POLYLOCK POLYLOCK PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE EF, 5 EF, 5 EF, 5 EF, 6, 16 EF, 6, 16 EF, 6, 16

(all with standard length inlet valves) REQUIRES

FACTORY HEADS with factory valvetrain geometry • BRODIX: -1, -2 PART NO. ST 2003 YT 5003 YT 5013 YT 6317 YT 6318 YT 6319

RATIO 1.7 HYD 1.7 HYD 1.8 HYD 1.7 ADJ 1.75 ADJ 1.8 ADJ

18 | YELLA TERRA

SIZE 7/16” 7/16” 7/16” 7/16” 7/16” 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER POLYLOCK POLYLOCK POLYLOCK PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE EF, 5 EF, 5 EF, 5 EF, 6, 16 EF, 6, 16 EF, 6, 16

(all with standard length inlet valves) REQUIRES

BRODIX • BRODIX: 2x, 3, 4 PART NO. ST 2003 YT 5003 YT 5013 YT 6603 YT 6604

RATIO 1.7 HYD 1.7 HYD 1.8 HYD 1.7 ADJ 1.75x1.7 ADJ

(all with +150” or longer inlet valves) SIZE 7/16” 7/16” 7/16” 7/16” 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT

BRAND STREET TERRA ULTRALITE PRO PRO STREET PLATINUM

ADJUSTER POLYLOCK POLYLOCK POLYLOCK PUSHROD SCREW PUSHROD SCREW

APPLICATION MAX OPEN SPRING PRESS. FACTORY REPLACEMENT/STREET <450lbs FACTORY REPLACEMENT/STREET <480lbs STREET / STRIP <600lbs RACE / STRIP <900lbs

FOOTNOTE EF, 5 EF, 5 EF, 5 EF, 6, 16 EF, 6, 16

REQUIRES

CHEV PERFORMANCE • CHEV PERFORMANCE: Bowtie PART NO. ST 2003 YT 5003 YT 5013 YT 6603 YT 6604

RATIO 1.7 HYD 1.7 HYD 1.8 HYD 1.7 ADJ 1.75x1.7 ADJ

SIZE 7/16” 7/16” 7/16” 7/16” 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER POLYLOCK POLYLOCK POLYLOCK PUSHROD SCREW PUSHROD SCREW

(all with +150” or longer inlet valves)

FOOTNOTE EF, 5 EF, 5 EF, 5 EF, 6, 16 EF, 6, 16

REQUIRES

(all with +150” or longer inlet valves)

FOOTNOTE EF, 5 EF, 5 EF, 5 EF, 6, 16 EF, 6, 16

REQUIRES

DART • Iron Eagle • Pro 1 • Big M 410 PART NO. ST 2003 YT 5003 YT 5013 YT 6603 YT 6604

RATIO 1.7 HYD 1.7 HYD 1.8 HYD 1.7 ADJ 1.75x1.7 ADJ

SIZE 7/16” 7/16” 7/16” 7/16” 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER POLYLOCK POLYLOCK POLYLOCK PUSHROD SCREW PUSHROD SCREW

EDELBROCK • Victor Jnr. PART NO. ST 2003 YT 5003 YT 5013 YT 6603 YT 6604

RATIO 1.7 HYD 1.7 HYD 1.8 HYD 1.7 ADJ 1.75x1.7 ADJ

SIZE 7/16” 7/16” 7/16” 7/16” 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER POLYLOCK POLYLOCK POLYLOCK PUSHROD SCREW PUSHROD SCREW

(all with +150” or longer inlet valves)

FOOTNOTE EF, 5 EF, 5 EF, 5 EF, 6, 16 EF, 6, 16

REQUIRES

(all with +150” or longer inlet valves)

FOOTNOTE EF, 5 EF, 5 EF, 5 EF, 6, 16 EF, 6, 16

REQUIRES

WORLD PRODUCTS • Merlin PART NO. ST 2003 YT 5003 YT 5013 YT 6603 YT 6604

RATIO 1.7 HYD 1.7 HYD 1.8 HYD 1.7 ADJ 1.75x1.7 ADJ

SIZE 7/16” 7/16” 7/16” 7/16” 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER POLYLOCK POLYLOCK POLYLOCK PUSHROD SCREW PUSHROD SCREW

YELLA TERRA | 19

CHRYSLER INLINE 6 FACTORY HEAD • HEMI: 215, 245, 265 PART NO. ST 2036 ST 2036A YT 5036 YT 5037 YT 5036A YT 5037A

RATIO 1.7 HYD 1.7 HYD 1.7 HYD 1.73 HYD 1.7 HYD 1.73 HYD

SIZE 3/8” 7/16” 3/8” 3/8” 7/16” 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT STUD MOUNT STUD MOUNT STUD MOUNT STUD MOUNT

SIZE

ADJUSTER POLYLOCK POLYLOCK POLYLOCK POLYLOCK POLYLOCK POLYLOCK

FOOTNOTE EF, 5, 15 2, 3, 5, 15 EF, 5, 15 EF, 5, 15 2, 3, 5, 15 2, 3, 5, 15

REQUIRES

MOUNT TYPE ADJUSTER MODULAR SHAFT PUSHROD SCREW

FOOTNOTE 12

REQUIRES

MOUNT TYPE STUD MOUNT STUD MOUNT

ADJUSTER POLYLOCK POLYLOCK

FOOTNOTE EF, 5, 15 EF, 5, 15

REQUIRES

ADJUSTER PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE 13 12 12

REQUIRES

MOUNT TYPE ADJUSTER MODULAR SHAFT PUSHROD SCREW ORIGINAL SHAFT PUSHROD SCREW

FOOTNOTE 12 13

REQUIRES

ADJUSTER PUSHROD SCREW

FOOTNOTE 2, 3, 6

REQUIRES

ADJUSTER

FOOTNOTE EF, 17 EF, 17

REQUIRES

• SLANT 6: 170, 198, 225 PART NO. YT 6711

RATIO

CYLINDER HEAD INNOVATIONS (CHI) • HEMI: 215, 245, 265 PART NO. YT 5036CHI YT 5037CHI

RATIO 1.7 1.73

SIZE 7/16” 7/16”

CHRYSLER V8 MOPAR FACTORY HEAD • SMALL BLOCK LA ENGINE: 273, 318, 340, 360 PART NO. YT 6011 YT 6001 YT 6300

RATIO 1.5 ADJ 1.5 ADJ 1.65 ADJ

SIZE

MOUNT TYPE ORIGINAL SHAFT MODULAR SHAFT MODULAR SHAFT

• BIG BLOCK R & RB ENGINE: 361, 383, 440 PART NO. YT 6012 YT 6013

RATIO 1.5 ADJ 1.5 ADJ

SIZE

EDELBROCK • Performer RPM Magnum 61769, 61775, 61779 PART NO. YT 6712

RATIO 1.65 ADJ

SIZE 7/16”

MOUNT TYPE SHAFT MOUNT

FORD INLINE 6 FACTORY HEAD • FALCON 6 (PRE CROSSFLOW): 144, 170, 200, 250 PART NO. ST 2014 YT 6014

RATIO 1.65 HYD 1.65 ADJ

20 | YELLA TERRA

SIZE 5/16” 5/16”

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT

BRAND STREET TERRA PRO STREET PLATINUM

FACTORY HEAD

APPLICATION MAX OPEN SPRING PRESS. FACTORY REPLACEMENT/STREET <450lbs STREET / STRIP <600lbs RACE / STRIP <900lbs

• AUSTRALIAN CROSSFLOW IRON & ALLOY: 200, 250 PART NO. ST 2034 ST 2018 YT 6018 YT 5011 YT 6345 YT 6345A

RATIO 1.72 HYD 1.72 ADJ 1.73 ADJ 1.73 HYD 1.73 ADJ 1.73 ADJ

SIZE 5/16” 5/16” 5/16” 7/16” 7/16” 7/16”

MOUNT TYPE PEDESTAL MOUNT PEDESTAL MOUNT PEDESTAL MOUNT STUD MOUNT PEDESTAL MOUNT PEDESTAL MOUNT

ADJUSTER

FOOTNOTE EF, 5 EF, 5 EF, 5 2, 3, 5 2, 3 2, 3

REQUIRES

FOOTNOTE 20 20 2, 3

REQUIRES

+.080” SUIT HIGHER VALVES

FORD ESSEX V6 FACTORY HEAD • 2.5L, 3.0L, 3.4L PART NO. ST 2007 YT 5016 YT 6344

RATIO 1.5 HYD 1.55 HYD 1.6 ADJ

SIZE 3/8” 3/8” 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT PEDESTAL MOUNT

ADJUSTER POLYLOCK POLYLOCK PUSHROD SCREW

FORD V8 CLEVELAND & BIG BLOCK FACTORY HEAD • CLEVELAND: 302 Oval Combustion Chamber • CLEVELAND: 351 Round Combustion Chamber PART NO. ST 2035 ST 2015 ST 2003 YT 6015 YT 5006 YT 6321 YT 6321A YT 6322 YT 6322A

RATIO 1.72 HYD 1.72 ADJ 1.72 HYD 1.73 ADJ 1.73 HYD 1.73 ADJ 1.73 ADJ 1. 8 ADJ 1.8 ADJ

SIZE 5/16” 5/16” 7/16” 5/16” 7/16” 7/16” 7/16” 7/16” 7/16”

• CLEVELAND: 400 • BIG BLOCK: 429, 460

MOUNT TYPE PEDESTAL MOUNT PEDESTAL MOUNT STUD MOUNT PEDESTAL MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER HYDRAULIC PUSHROD SCREW POLYLOCK PUSHROD SCREW POLYLOCK PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE EF, 5 EF, 5 2, 3, 5 EF, 5 2, 3, 5 2, 3, 16 2, 3, 16 2, 3, 16 2, 3, 16

REQUIRES

ALL INC. DRILL ALIGN TOOL & PIN SUIT +.150” TALLER VALVE SUIT +.150” TALLER VALVE

FACTORY HEADS with factory valvetrain geometry • AFD: 2V & 4V • A-460 • FORD RACING PART NO. ST 2003 YT 5006 YT 6321 YT 6321A YT 6322 YT 6322A

• C.H.I: 3V Alloy • PRO-FILER PERFORMANCE: BBF • BRODIX: BBF RATIO 1.72 HYD 1.73 HYD 1.73 ADJ 1.73 ADJ 1.8 ADJ 1.8 ADJ

SIZE 7/16” 7/16” 7/16” 7/16” 7/16” 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

• EDELBROCK: Performer RPM 460, 351C & Clevor • TRICKFLOW: Powerport ADJUSTER POLYLOCK POLYLOCK PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE 2, 3, 5 2, 3, 5 2, 3, 16 2, 3, 16 2, 3, 16 2, 3, 16

REQUIRES

SUIT +.150” HIGHER VALVE SUIT +.150” HIGHER VALVE

YELLA TERRA | 21

FORD V8 WINDSOR FACTORY HEAD • 221, 255, 260, 289, 302 - Carb engines PART NO. ST 2004 ST 2005 YT 5004 YT 5005 YT 5026 YT 6314

RATIO 1.6 HYD 1.6 HYD 1.6 HYD 1.6 HYD 1.7 HYD 1.65 ADJ

SIZE 3/8” 7/16” 3/8” 7/16” 7/16” 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT STUD MOUNT STUD MOUNT STUD MOUNT SHAFT MOUNT

ADJUSTER POLYLOCK POLYLOCK POLYLOCK POLYLOCK POLYLOCK PUSHROD SCREW

FOOTNOTE EF, 5 2, 3, 5 EF, 5 2, 3, 5 2, 3, 5 2, 3, 6

• 302, 351: Carb engines PART NO. ST 2044 YT 5004 YT 5005 YT 5026 YT 6314

RATIO 1.6 HYD 1.6 HYD 1.6 HYD 1.7 HYD 1.65 ADJ

SIZE 3/8” 3/8” 7/16” 7/16” 7/16”

MOUNT TYPE SHAFT MOUNT STUD MOUNT STUD MOUNT STUD MOUNT SHAFT MOUNT

ADJUSTER HYDRAULIC POLYLOCK POLYLOCK POLYLOCK PUSHROD SCREW

FOOTNOTE EF, 5 EF, 5 2, 3, 5 2, 3, 5 2, 3, 6

(3/8” stud type head slotted pushrod holes) REQUIRES STUD BOSSES MACHINED STUD BOSSES MACHINED STUD BOSSES MACHINED STUD BOSSES MACHINED STUD BOSSES MACHINED STUD BOSSES MACHINED (3/8” stud type head round pushrod holes) REQUIRES SUITS FACTORY 3/8” STUDS STUD BOSSES MACHINED STUD BOSSES MACHINED STUD BOSSES MACHINED STUD BOSSES MACHINED

• 302, 351: Carb engines PART NO. ST 2045 YT 5004 YT 5005 YT 5026 YT 6314

RATIO 1.6 HYD 1.6 HYD 1.6 HYD 1.7 HYD 1.65 ADJ

SIZE 3/8”x5/16 3/8” 7/16” 7/16” 7/16”

MOUNT TYPE SHAFT MOUNT STUD MOUNT STUD MOUNT STUD MOUNT SHAFT MOUNT

ADJUSTER HYDRAULIC POLYLOCK POLYLOCK POLYLOCK PUSHROD SCREW

FOOTNOTE EF, 6 2, 3, 5 2, 3, 5 2, 3, 6

(3/8” x 5/16” stepped studs) REQUIRES STUD BOSSES MACHINED STUD BOSSES MACHINED STUD BOSSES MACHINED STUD BOSSES MACHINED

• 5.0L - 5.8L: Factory iron EFI - 1981 onwards • GT-40P/ FORD SVO PART NO. ST 2046 ST 2047 ST 2028 YT 6027 YT 5004 YT 5005 YT 5026 YT 6314

RATIO 1.6 HYD 1.6 ADJ 1.72 ADJ 1.72 HYD 1.6 HYD 1.6 HYD 1.7 HYD 1.65 ADJ

SIZE 5/16” 5/16” 5/16” 5/16” 3/8” 7/16” 7/16” 7/16”

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT STUD MOUNT STUD MOUNT STUD MOUNT SHAFT MOUNT

ADJUSTER HYDRAULIC PUSHROD SCREW PUSHROD SCREW HYDRAULIC POLYLOCK POLYLOCK POLYLOCK PUSHROD SCREW

FOOTNOTE EF, 6 EF, 6 EF, 6 EF, 6

REQUIRES

REPLACES ST 2027

2, 3, 5 2, 3, 5 2, 3, 6

FACTORY HEADS with factory valvetrain geometry • AFR: Alloy Renegades 302-351 • EDELBROCK: Performer 6027 - 6031 • EDELBROCK: Performer RPM 6021 - 6026 • EDELBROCK: Victor Jnr. 7716-7719 PART NO. ST 2004 ST 2005 YT 5004 YT 5005 YT 5026 YT 6610 YT 6611 YT 6612 YT 6629

RATIO 1.6 HYD 1.6 HYD 1.6 HYD 1.6 HYD 1.7 HYD 1.6 ADJ 1.65 ADJ 1.7 ADJ 1.7x1.6 ADJ

SIZE 3/8” 7/16” 3/8” 7/16” 7/16“ 7/16” 7/16” 7/16” 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT STUD MOUNT STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER POLYLOCK POLYLOCK POLYLOCK POLYLOCK POLYLOCK PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE

SIZE 7/16” 7/16” 7/16”

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE 2, 3, 6 2, 3, 6 2, 3, 6

REQUIRES

2, 3, 5 2, 3, 5 2, 3, 5 2, 3, 6 2, 3, 6 2, 3, 6 2, 3, 6

YATES • FORD WINDSOR PART NO. YT 6323 YT 5021 YT 6324

RATIO 1.6 ADJ 1.65 ADJ 1.7 ADJ

22 | YELLA TERRA

(Non stud type heads)

REQUIRES

BRAND STREET TERRA ULTRALITE PRO STREET PLATINUM

DART • Windsor Jnr. (Iron & Alloy) PART NO. ST 2004 ST 2005 YT 5004 YT 5005 YT 5026 YT 6323 YT 5021 YT 6324

RATIO 1.6 HYD 1.6 HYD 1.6 HYD 1.6 HYD 1.7 HYD 1.6 ADJ 1.65 ADJ 1.7 ADJ

APPLICATION MAX OPEN SPRING PRESS. FACTORY REPLACEMENT/STREET <450lbs FACTORY REPLACEMENT/STREET <400lbs STREET / STRIP <600lbs RACE / STRIP <900lbs

SIZE 3/8” 7/16” 3/8” 7/16” 7/16“ 7/16” 7/16” 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT STUD MOUNT STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER POLYLOCK POLYLOCK POLYLOCK POLYLOCK POLYLOCK PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE

RATIO 1.6 HYD 1.6 HYD 1.6 HYD 1.6 HYD 1.7 HYD 1.6 ADJ 1.65 ADJ 1.7 ADJ

SIZE 3/8” 7/16” 3/8” 7/16” 7/16“ 7/16” 7/16” 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT STUD MOUNT STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER POLYLOCK POLYLOCK POLYLOCK POLYLOCK POLYLOCK PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE

RATIO 1.6 ADJ 1.7x1.6 ADJ

SIZE 7/16” 7/16”

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT

ADJUSTER PUSHROD SCREW PUSHROD SCREW

FOOTNOTE 2, 3, 6 2, 3, 6

REQUIRES

RATIO 1.6 ADJ

SIZE 7/16”

MOUNT TYPE SHAFT MOUNT

ADJUSTER PUSHROD SCREW

FOOTNOTE 2, 3, 6

REQUIRES

RATIO 1.6 HYD 1.6 HYD 1.6 HYD 1.6 HYD 1.7 HYD 1.6 ADJ 1.65 ADJ 1.7 ADJ

SIZE 3/8” 7/16” 3/8” 7/16” 7/16“ 7/16” 7/16” 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT STUD MOUNT STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER POLYLOCK POLYLOCK POLYLOCK POLYLOCK POLYLOCK PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE

REQUIRES 30mm PEDESTALS 30mm PEDESTALS 30mm PEDESTALS 30mm PEDESTALS 30mm PEDESTALS 30mm PEDESTALS 30mm PEDESTALS 30mm PEDESTALS

SIZE 7/16”

MOUNT TYPE SHAFT MOUNT

ADJUSTER PUSHROD SCREW

FOOTNOTE 2, 3, 6

REQUIRES

SIZE 3/8” 7/16” 7/16” 7/16” 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER POLYLOCK POLYLOCK POLYLOCK PUSHROD SCREW PUSHROD SCREW

FOOTNOTE

REQUIRES

2, 3, 5 2, 3, 5 2, 3, 6 2, 3, 6

.274” offset inlet .274” offset inlet

REQUIRES

2, 3, 5 2, 3, 5 2, 3, 5 2, 3, 6 2, 3, 6 2, 3, 6

FORD MOTORSPORT • J302 K302 PART NO. ST 2004 ST 2005 YT 5004 YT 5005 YT 5026 YT 6323 YT 5021 YT 6324

REQUIRES

2, 3, 5 2, 3, 5 2, 3, 5 2, 3, 6 2, 3, 6 2, 3, 6

• N351 Iron PART NO. YT 6606 YT 6607

FORD MOTORSPORT • SBF: Pro Action • SBF: Pro Elite PART NO. YT 6637 • ROUSH: 200 PART NO. ST 2004 ST 2005 YT 5004 YT 5005 YT 5026 YT 6323 YT 5021 YT 6324

2, 3, 5 2, 3, 5 2, 3, 5 2, 3, 6 2, 3, 6 2, 3, 6

TRICKFLOW •TRICKFLOW: 302-351 •TRICKFLOW & WILBURT: Street Heat PART NO. YT 5027

RATIO 1.6 ADJ

• TRICKFLOW: Twisted Wedge PART NO. YT 5004 YT 5005 YT 5026 YT 6358 YT 6353

RATIO 1.6 HYD 1.6 HYD 1.7 HYD 1.6 ADJ 1.7 ADJ

YELLA TERRA | 23

HOLDEN INLINE 6 FACTORY HEAD • GREY: 132.5, 138 PART NO. YT 6743 YT 6743B

RATIO 1.6 ADJ 1.6 ADJ

SIZE

• RED: 149, 161, 179, 186 PART NO. ST 2007 ST 2008 ST 2012 ST 2030A ST 2031A YT 5007 YT 5008 YT 5029 YT 6312 YT 6332 YT 6371

RATIO 1.5 HYD 1.5 HYD 1.6 HYD 1.5 HYD 1.5 ADJ 1.5 HYD 1.5 HYD 1.5 ADJ 1.6 ADJ 1.65 ADJ 1.7 ADJ

SIZE 3/8” 7/16” 7/16” 5/16” 5/16” 3/8” 7/16” 7/16” 7/16” 7/16” 7/16”

MOUNT TYPE ADJUSTER MODULAR SHAFT PUSHROD SCREW MODULAR SHAFT PUSHROD SCREW

FOOTNOTE EF, 12, 24 EF, 12, 23, 24

MOUNT TYPE STUD MOUNT STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER POLYLOCK POLYLOCK POLYLOCK HYDRAULIC PUSHROD SCREW POLYLOCK POLYLOCK PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

(Factory 3/8” pressed in rocker studs)

FOOTNOTE EF, 9 2, 3, 10 2, 3, 10 2, 3, 6, 19 2, 3, 6, 19 EF, 9 2, 3, 10 2, 3, 6 2, 3, 6 2, 3, 6 2, 3, 6

• RED: 173, 202 • BLUE: 202 (3300cc) • BLACK: 202 (3300cc) PART NO. ST 2007 ST 2008 ST 2012 ST 2030 ST 2031 YT 5007 YT 5008 YT 5029 YT 6312 YT 6332 YT 6371

RATIO 1.5 HYD 1.5 HYD 1.6 HYD 1.5 HYD 1.5 ADJ 1.5 HYD 1.5 HYD 1.5 ADJ 1.6 ADJ 1.65 ADJ 1.7 ADJ

SIZE 3/8” 7/16” 7/16” 5/16” 5/16” 3/8” 7/16” 7/16” 7/16” 7/16” 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER POLYLOCK POLYLOCK POLYLOCK HYDRAULIC PUSHROD SCREW POLYLOCK POLYLOCK PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

REQUIRES

REQUIRES

(Factory 5/16” screw in rocker studs)

FOOTNOTE 2, 3, 18, 10 2, 3, 10 2, 3, 10 EF, 6 EF, 6 2, 3, 18, 10 2, 3, 10 2, 3, 6 2, 3, 6 2, 3, 6 2, 3, 6

REQUIRES

YELLA TERRA • 12 Port Alloy (ACH/A 33C72 & ACH/A 33C56) PART NO. ST 2008 ST 2012 ST 2030A ST 2031A YT 5008 YT 5029 YT 6312 YT 6332 YT 6371

RATIO 1.5 HYD 1.6 HYD 1.5 HYD 1.5 ADJ 1.5 HYD 1.5 ADJ 1.6 ADJ 1.65 ADJ 1.7 ADJ

SIZE 7/16” 7/16” 5/16” 5/16” 7/16” 7/16” 7/16” 7/16” 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER POLYLOCK POLYLOCK HYDRAULIC PUSHROD SCREW POLYLOCK PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE EF, 10 EF, 10 EF, 6, 19 EF, 6, 19 EF, 10 EF, 6 EF, 6 EF, 6 EF, 6

(Accept 7/16” rocker thread) REQUIRES

J.ZED • Duggan Alloy PART NO. YT 6630 YT 6632

RATIO 1.7 ADJ 1.7 ADJ

24 | YELLA TERRA

SIZE 7/16” 7/16”

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT

ADJUSTER PUSHROD SCREW PUSHROD SCREW

FOOTNOTE EF, 6 EF, 16

(Accept 7/16” rocker thread) REQUIRES

HOLDEN V8

BRAND STREET TERRA PRO STREET PLATINUM

FACTORY HEAD

APPLICATION MAX OPEN SPRING PRESS. FACTORY REPLACEMENT/STREET <450lbs STREET / STRIP <600lbs RACE / STRIP <900lbs

• CARBURETTOR ENGINES: 253, 308, 304 (1969-1988) PART NO. ST 2009 ST 2010 ST 2032 ST 2033 ST 2043 YT 5010 YT 5032 YT 5033 YT 5020 YT 5020A

RATIO 1.65 HYD 1.65 HYD 1.65 HYD 1.65 ADJ 1.72 ADJ 1.65 HYD 1.65 HYD 1.65 ADJ 1.65 ADJ 1.65 ADJ

SIZE 3/8” 7/16” 5/16” 5/16” 5/16” 7/16” 5/16” 5/16” 7/16” 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER POLYLOCK POLYLOCK HYDRAULIC PUSHROD SCREW PUSHROD SCREW POLYLOCK HYDRAULIC PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE 2, 3, 18, 11 2, 3, 11 EF, 6 EF, 6 EF, 6 2, 3, 11 EF, 6 EF, 6 2, 3, 6 2, 3, 6

• EFI ENGINES: 5.0L, 5.7L (1988-2000) PART NO. ST 2009 ST 2010 ST 2032 ST 2033 ST 2043 YT 5010 YT 6309 YT 6030 YT 6030A YT 6030B YT 6030C

RATIO 1.65 HYD 1.65 HYD 1.65 HYD 1.65 ADJ 1.72 ADJ 1.65 HYD 1.65 ADJ 1.65 ADJ 1.65 ADJ 1.65 ADJ 1.65 ADJ

SIZE 3/8” 7/16” 5/16” 5/16” 5/16” 7/16” 5/16” 7/16” 7/16” 7/16” 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER POLYLOCK POLYLOCK HYDRAULIC PUSHROD SCREW PUSHROD SCREW POLYLOCK PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHORD SCREW

FOOTNOTE 2, 3, 18, 11 2, 3, 11 EF, 6 EF, 6 EF, 6 2, 3, 11 EF, 6 2, 3, 6 2, 3, 6 2, 3, 6 2, 3, 6

(Factory 5/16” screw in rocker studs) REQUIRES

SUIT +.150” TALLER VALVE (Factory 5/16” screw in rocker studs) REQUIRES

INC. STANDARD 2” CAPSCREW (YT 6088) INC. LONGER 2 1/4” CAPSCREW (YT 6098) SUIT 3/8” P/RODS +.080” INLET OFFSET SUIT 3/8” P/RODS. INC. 2 1/4” CAPSCREW

YELLA TERRA • Hi-Port Alloy (ABH/A 308-3) PART NO. ST 2010 ST 2032A ST 2033A YT 5010 YT 5032A YT 5033A YT 5020 YT 5020A

RATIO 1.65 HYD 1.65 HYD 1.65 ADJ 1.65 HYD 1.65 HYD 1.65 ADJ 1.65 ADJ 1.65 ADJ

SIZE 7/16” 5/16” 5/16” 7/16” 5/16” 5/16” 7/16” 7/16”

MOUNT TYPE STUD MOUNT SHAFT MOUNT SHAFT MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER POLYLOCK HYDRAULIC PUSHROD SCREW POLYLOCK HYDRAULIC PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE EF, 11 EF, 6, 19 EF, 6, 19 EF, 11 EF, 6, 19 EF, 6, 19 EF, 6 EF, 6

(Accept 7/16” rocker thread) REQUIRES

SUIT +.150” TALLER VALVE

• Alloy (ABH/A 5000-5) PART NO. YT 5040

RATIO 1.65 ADJ

SIZE 7/16”

MOUNT TYPE SHAFT MOUNT

ADJUSTER PUSHROD SCREW

FOOTNOTE EF, 6

(Accept 7/16” rocker thread) REQUIRES

• Alloy (ABH/A 5000-9) PART NO. YT 6313 YT 6313A

RATIO 1.65 ADJ 1.65 ADJ

SIZE 7/16” 7/16”

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT

ADJUSTER PUSHROD SCREW PUSHROD SCREW

FOOTNOTE EF, 6 EF, 6

(Accept 7/16” rocker thread) REQUIRES INC. STANDARD 2” CAPSCREW (YT 6088) INC. LONGER 2 1/4” CAPSCREW (YT 6098)

• Alloy (ABH/A 5000-11) PART NO. YT 6756

RATIO 1.65 ADJ

SIZE 7/16”

MOUNT TYPE SHAFT MOUNT

ADJUSTER PUSHROD SCREW

FOOTNOTE EF, 6

(Accept 7/16” rocker thread) REQUIRES

YELLA TERRA | 25

HOLDEN V8

(CONTINUED)

COME RACING • 590 Alloy series VN PART NO. ST 2010 ST 2032A ST 2033A YT 5010 YT 6309A YT 6030 YT 6030A YT 6030B YT 6030C

RATIO 1.65 HYD 1.65 HYD 1.65 ADJ 1.65 HYD 1.65 ADJ 1.65 ADJ 1.65 ADJ 1.65 ADJ 1.65 ADJ

SIZE 7/16” 5/16” 5/16” 7/16” 5/16” 7/16” 7/16” 7/16” 7/16”

MOUNT TYPE STUD MOUNT SHAFT MOUNT SHAFT MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER POLYLOCK HYDRAULIC PUSHROD SCREW POLYLOCK PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW PUSHORD SCREW

FOOTNOTE EF, 11 EF, 6, 19 EF, 6, 19 EF, 11 EF, 6, 19 EF, 6 EF, 6 EF, 6 EF, 6

(Accept 7/16” rocker thread) REQUIRES

INC. STANDARD 2” CAPSCREW (YT 6088) INC. LONGER 2 1/4” CAPSCREW (YT 6098) SUIT 3/8” P/RODS +.080” INLET OFFSET SUIT 3/8” P/RODS. INC. 2 1/4” CAPSCREW

HOLDEN INLINE 4 FACTORY HEAD • STARFIRE PART NO. ST 2052 ST 2053

RATIO 1.5 HYD 1.5 ADJ

SIZE 5/16” 5/16”

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT

ADJUSTER HYDRAULIC PUSHROD SCREW

FOOTNOTE EF, 6 EF, 6

REQUIRES

SIZE 5/16”

MOUNT TYPE SHAFT TYPE

ADJUSTER HYDRAULIC

FOOTNOTE EF, 6

REQUIRES

SIZE 5/16” 5/16” 5/16”

MOUNT TYPE SHAFT TYPE SHAFT TYPE SHAFT TYPE

ADJUSTER HYDRAULIC HYDRAULIC PUSHROD SCREW

FOOTNOTE EF, 6 EF, 6 EF, 6

REQUIRES

FOOTNOTE 13 12

REQUIRES

FOOTNOTE 12

REQUIRES

HOLDEN V6 See Buick V6 3800 (page: 11)

JEEP FACTORY HEAD • INLINE 4: 2.5L (suit 1982-2002) PART NO. YT 6626

RATIO 1.6 HYD

• INLINE 6: 4.0L - 4.2L PART NO. YT 6627 YT 6628 YT 6328

RATIO 1.6 HYD 1.7 HYD 1.6 ADJ

• V6: 3.3 EGA (suit WRANGLER 2007 - 2011) PART NO. YT 6714 YT 6716

RATIO 1.65 HYD 1.65 HYD

SIZE

MOUNT TYPE ADJUSTER ORIGINAL SHAFT HYDRAULIC MODULAR SHAFT HYDRAULIC

NISSAN/DATSUN INLINE 4 FACTORY HEAD • A10

• A12

PART NO. YT 6023

• A12A • A13 RATIO 1.55 ADJ

26 | YELLA TERRA

SIZE

• A14

• A15

• 1000

• 1200

• 1500

MOUNT TYPE ADJUSTER MODULAR SHAFT PUSHROD SCREW

OLDSMOBILE V8 FACTORY HEAD

BRAND STREET TERRA PRO STREET PLATINUM

APPLICATION MAX OPEN SPRING PRESS. FACTORY REPLACEMENT/STREET <450lbs STREET / STRIP <600lbs RACE / STRIP <900lbs

• 350-455 : Until 1980 (with 5/16” pushrod ball) PART NO. YT 6671

RATIO 1.6 ADJ

SIZE 7/16”

MOUNT TYPE STUD MOUNT

ADJUSTER PUSHROD SCREW

FOOTNOTE 2, 3, 5

REQUIRES

REQUIRES

PONTIAC V8 FACTORY HEAD • SUPER DUTY: 1961-1981 (fitted with rocker studs) PART NO. YT 5010 YT 6029 YT 6372 YT 6370

RATIO 1.65 1.5 1.65 1.55

SIZE 7/16” 7/16” 7/16” 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER POLYLOCK POLYLOCK PUSHROD SCREW PUSHROD SCREW

FOOTNOTE 2, 3, 5 2, 3, 5 NOTE 7/16” NOTE 7/16”

RATIO SIZE 1.55x1.55 ADJ 7/16” 1.6x1.6 ADJ 7/16” 1.6x1.5 ADJ 7/16”

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT SHAFT MOUNT

ADJUSTER PUSHROD SCREW PUSHROD SCREW PUSHROD SCREW

FOOTNOTE NOTE 7/16” NOTE 7/16” NOTE 7/16”

REQUIRES

RATIO SIZE 1.7 ADJ 7/16” 1.75x1.7 ADJ 7/16”

MOUNT TYPE SHAFT MOUNT SHAFT MOUNT

ADJUSTER PUSHROD SCREW PUSHROD SCREW

FOOTNOTE NOTE 7/16” NOTE 7/16”

REQUIRES MAY REQ. SLIGHT MACHINING OF SHAFT FOR CLEARANCE

MOUNT TYPE SHAFT MOUNT

ADJUSTER PUSHROD SCREW

FOOTNOTE NOTE 7/16”

REQUIRES

ADJUSTER POLYLOCK POLYLOCK PUSHROD SCREW PUSHROD SCREW

FOOTNOTE 2, 3, 5 2, 3, 5 NOTE 7/16” NOTE 7/16”

REQUIRES

ADJUSTER PUSHROD SCREW

FOOTNOTE NOTE 7/16”

REQUIRES

MOUNT TYPE ADJUSTER MODULAR SHAFT PUSHROD SCREW MODULAR SHAFT PUSHROD SCREW

FOOTNOTE 12 12, 23

REQUIRES

+.240” INLET OFFSET

• 867 PONTIAC NASCAR 23° PART NO. YT 6308 YT 6325 YT 6338 • PONTIAC: CV-1 PART NO. YT 6603 YT 6604

• PONTIAC: 6X Cast Iron RATIO 1.65 ADJ

PART NO. YT 6369

SIZE 7/16”

AFTERMARKET HEADS with factory valvetrain geometry • EDELBROCK: Performer RPM 6056 RATIO 1.65 1.5 1.65 1.55

PART NO. YT 5010 YT 6029 YT 6372 YT 6370

SIZE 7/16” 7/16” 7/16” 7/16”

MOUNT TYPE STUD MOUNT STUD MOUNT SHAFT MOUNT SHAFT MOUNT

+.240” INLET OFFSET

• KAUFFMAN RACING EQUIPMENT: D Port Aluminum PART NO. YT 6369

RATIO 1.65 ADJ

SIZE 7/16”

MOUNT TYPE SHAFT MOUNT

VOLVO INLINE 4 FACTORY HEAD • B20: 1969-1981 PART NO. YT 6674 YT 6674A

RATIO 1.65 ADJ 1.65 ADJ

SIZE

YELLA TERRA | 27

STUDEBAKER V8 FACTORY HEAD • AVANTI 289 PART NO. YT 6744

RATIO 1.75 ADJ

NOTES

28 | YELLA TERRA

SIZE 5/16”

MOUNT TYPE ADJUSTER MODULAR SHAFT PUSHROD SCREW

FOOTNOTE 12

REQUIRES

FOOTNOTES EF.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

16.

17.

18.

19.

20.

21.

22.

23.

24.

25.

26.

27.

EASY FIT replaces original rockers. Rockers bolt on. Fits standard mountings. No machining required.

Machine .300 - .320” from rocker pads.

Drill and tap 7/16” UNC. Drill and tap 10mmx1.5.

Requires guide plates (sold separately) use original where applicable.

Shaft mount rockers do not require guide plates.

Requires YT 5132 - 10mm rubber spacer kit.

Requires YT 5123 - 25mm alloy spacer kit.

Requires YT 4986 - guide plates and hardened pushrods.

Requires YT 4987 - guide plates with brass bobbins.

Requires YT 3081 - guide plates.

Total system includes cradle, shafts and arms.

Bushed arms to suit standard shafts.

All Buick V6 rockers include +.240” larger pushrods YT 6574 and special aligning plate YT 6561.

Studs included.

Drill head for pedestal aligning pin (drill align tool & pin supplied).

Requires YT 14101-12 - pushrod & lifter kit. Includes adaptor plates.

170ci/Narrow block may differ in pushrod length.

Requires YT 1853 - 3/8” x 7/16” (12 pack).

Includes 5/16” x 7/16” adaptors.

Drive studs .312” further into head, removal not required, rockers mount to studs.

Includes self aligning roller.

Includes YT 5132 - 10mm rubber spacer kit.

Special ball adjusters to suit factory style cup-end pushrods Uses OEM style through shaft oiling Rockers for LS7 heads with cast pedestals machined off to Jesel specs. Retains the Jesel machined footprint of 3/8” and 7/16” UNF threads. Will require high rocker cover spacers (YT 5123). May require shims to ensure flatness of shaft across pedestals.

“D” Saddles (included) must be used to ensure correct radial fitment of the rocker shaft into the rocker cradle of the factory LS7 cylinder head. Some LS7 cylinder heads have variations in Rocker post machining and may require some further relief to clear the bottom of the Yella Terra Rocker. Special Instructions included.

Includes YT 5143 8.00mm x 8.00mm LS7 adaptors

YELLA TERRA | 29

MOUNTING HARDWARE & SPARES PEDESTALS 7/16” ID PART NO.

HEIGHT METRIC

HEIGHT IMPERIAL

12 PACK

16 PACK

YT 6093 YT 6594 YT 6180 YT 6087 YT 6217 YT 6160 YT 6595

18.00mm 20.00mm 23.00mm 25.00mm 27.50mm 28.70mm 30.00mm

0.708” 0.785” 0.905” 0.985” 1.083” 1.130” 1.180”

YT 18311 YT 18312 YT 18313 YT 18314 YT 18315 YT 18316 YT 18317

YT 18321 YT 18322 YT 18323 YT 18324 YT 18325 YT 18326 YT 18327

12 PACK

16 PACK

5/16” & 8.0mm ID PART NO.

HEIGHT METRIC

HEIGHT IMPERIAL

YT 6600 YT 6512 YT 7005 YT 7011

18.50mm 20.00mm 22.20mm 25.00mm

0.725” 0.787” 0.874” 0.985”

SADDLES 7/16” ID

(a)

(a)

YT 18300 YT 18301 YT 18303 YT 18305

(c)

(b)

(height measured to bottom of saddle radius) PART NO.

HEIGHT METRIC

HEIGHT IMPERIAL

YT 6235 YT 6269 YT 6230 YT 6586 YT 6263

17.00mm 19.00mm 22.50mm 24.60mm 28.60mm

0.670” 0.748” 0.885” 0.970” 1.125”

PART NO.

HEIGHT METRIC

HEIGHT IMPERIAL

YT 6572 YT 7002

13.60mm 13.60mm

0.535” 0.535”

PART NO.

HEIGHT METRIC

HEIGHT IMPERIAL

YT 6559 YT 6575 YT 7003 YT 6571 YT 7001 YT 5044

11.40mm 12.40mm 12.40mm 13.60mm 13.60mm 14.10mm

0.449” 0.488” 0.488” 0.535” 0.535” 0.555”

3/8” ID

5/16” ID

12 PACK

16 PACK YT 18340 YT 18341 YT 18342 YT 18343 YT 18344

(b) 12 PACK

16 PACK

12 PACK

16 PACK

12 PACK

16 PACK

(c)

SPACERS 5/16” ID PART NO.

HEIGHT METRIC

HEIGHT IMPERIAL

YT 6550 YT 6227 YT 5049 YT 6592 YT 6591

9.75mm 12.60mm 15.00mm 19.60mm 21.00mm

0.383” 0.495” 0.590” 0.770” 0.826”

30 | YELLA TERRA

YT 18371 YT 18373 YT 18375 YT 18377 YT 18379

ADJUSTMENT SHIM KITS 7/16” ID

(a)

PART NO.

HEIGHT METRIC

HEIGHT IMPERIAL

YT 6579 YT 6279 YT 6279A YT 6279B YT 6580 YT 6580A YT 6581 YT 6582 YT 6582A

0.635mm 1.016mm 1.524mm 2.032mm 2.540mm 3.048mm 3.810mm 5.080mm 6.096mm

.025” .040” .060” .080” .100” .120” .150” .200” .240”

(a) 4 PACK

(b) 12 PACK

16 PACK

YT 18700 YT 18701 YT 18702 YT 18703 YT 18704 YT 18705 YT 18706 YT 18707 YT 18708

YT 18710 YT 18711 YT 18712 YT 18713 YT 18714 YT 18715 YT 18716 YT 18717 YT 18718

12 PACK

16 PACK

8.00mm & 5/16” ID (a) PART NO.

HEIGHT METRIC

HEIGHT IMPERIAL

YT 6578 YT 5041

0.508mm 1.194mm

.020” .047”

PEANUT SHAPE

4 PACK

YT 18725 YT 18721

(b)

PART NO.

HEIGHT METRIC

HEIGHT IMPERIAL

YT 6239X YT 6240X YT 6241X

0.635mm 1.270mm 2.540mm

.025” .050” .100”

CAPSCREWS 7/16”

(length measured under head)

PART NO.

LENGTH METRIC

LENGTH IMPERIAL

YT 6088 YT 6098 YT 6588

50.80mm 57.15mm 63.50mm

2” 21/4” 2 1/2”

4 PACK

12 PACK

16 PACK

YT 18112 YT 18114 YT 18116

YT 18122 YT 18124 YT 18126

12 PACK

16 PACK

3/8” PART NO.

LENGTH METRIC

LENGTH IMPERIAL

YT 6567

44.45mm

1 3/4”

4 PACK

PART NO.

LENGTH METRIC

4 PACK

YT 5108 YT 5047 YT 5050 YT 5045

25.40mm 38.10mm 44.45mm 50.80mm

LENGTH IMPERIAL 1” 1 1/2” 1 3/4” 2”

4 PACK

12 PACK

16 PACK

4 PACK

12 PACK

16 PACK

YT 18109

5/16” 12 PACK

YT 18055

16 PACK

YT 18101 YT 18102

8.00mm PART NO.

LENGTH METRIC

LENGTH IMPERIAL

YT 5128 YT 5129 YT 5133

45.00mm 50.00mm 35.00mm

1.772” 1.969” 1.378

PART NO.

LENGTH METRIC

LENGTH IMPERIAL

YT 6094

45.00mm

1.772”

10.00mm

YELLA TERRA | 31

MOUNTING HARDWARE & SPARES LASH ADJUSTER SCREWS THRU HOLE CUP

CROSS HOLE CUP

CROSS HOLE BALL

NO HOLE BALL

3/8” UNF CUP ADJUSTER PART NO.

LENGTH

4 PACK

12 PACK

16 PACK

YT 6206 YT 6161 YT 6169 YT 6589 YT 6565 YT 6061 YT 6564

24mm THRU HOLE 24mm CROSS HOLE 24mm CROSS HOLE H/D 26mm THRU HOLE 26mm THRU HOLE H/D 29mm THRU HOLE 30mm THRU HOLE H/D

YT 18001 YT 18002 YT 18003 YT 18004 YT 18005 YT 18006 YT 18007

YT 18011 YT 18012 YT 18013 YT 18014 YT 18015 YT 18016 YT 18017

YT 18021 YT 18022 YT 18023 YT 18024 YT 18025 YT 18026 YT 18027

4 PACK

12 PACK

16 PACK

12 PACK

16 PACK

3/8” UNF BALL ADJUSTER PART NO.

LENGTH

YT 6746

30.6mm CROSS HOLE

5/16” UNF BALL ADJUSTER PART NO.

LENGTH

4 PACK

YT 6156 YT 6176

28.6mm NO HOLE 30.3mm NO HOLE

YT 18008 YT 18009

POLYLOCKS

3/8” 4 PACK

12 PACK

16 PACK

YT 18190

YT 18191

YT 18192

4 PACK

12 PACK

16 PACK

YT 18193

YT 18194

YT 18195

7/16”

ROCKER STUDS

(a)

(b)

(c)

SIZE

DESCRIPTION

12 PACK

16 PACK

3/8” UNF x 7/16” UNC 7/16” UNF x 7/16” UNC

TYPE A TYPE B

YT 1853 YT 1855

YT 1854 YT 1856

SIZE

DESCRIPTION

6 PACK

12 PACK

7/16” UNF x 3/8” UNC

TYPE C - HEMI 6

YT 1851

YT 1852

32 | YELLA TERRA

VALVE COVER SPACER KITS CHEVROLET & HOLDEN LS DESCRIPTION

TYPE

PART NO.

ALUMINIUM 25mm SPACER KIT (SET 2 SPACERS & HARDWARE) RUBBER SPACER KIT SET OF 2 RUBBER EXTRUSION SEALS PLUS NUT EXTENSION

A B

YT 5123 YT 5132

TYPE B

TYPE A

PUSHROD GUIDE PLATES HOLDEN 6

DESCRIPTION

TYPE

6 PACK

1963 - 1971 PRESSED IN STUD. PRESS FIT. SUIT STD HARDENED P/RODS 7/16” SCREW IN STUD. SUIT 5/16” UNHARDENED P/RODS, INC. BOBBINS BRONZE LOCATING BOBBIN

TYPE A TYPE B*

YT 4986 YT 4987

DESCRIPTION

TYPE

8 PACK

7/16” SCREW IN STUD. SUIT 5/16” UNHARDENED P/RODS, INC. BOBBINS BRONZE LOCATING BOBBIN

TYPE B*

YT 3081

12 PACK

YT 4988

HOLDEN 8

TYPE A

16 PACK YT 3082

TYPE B

*NOTE: ALL “TYPE B” GUIDE PLATES REQUIRE HEAD MACHINING

YELLA TERRA | 33

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