GenX ® 185 and 195 Cylinder Heads for GM LT1 Trick Flow GenX 185 cylinder heads for naturally aspirated GM LT1 engines retain the factory compression ratio and have standard resolution CNC-profiled combustion chambers to amplify performance. The valve angles were reduced to 21° to increase piston-to-valve clearance and unshroud the chambers for better airflow. Power-building Fast As Cast® runners duplicate the profiles of fully CNC-ported heads, resulting in high airflow rates without costly CNC-porting. GenX 195 heads for forced induction engines retain the stock 23° valve angles and feature large, standard cast combustion chambers to reduce compression and large Fast As Cast® runners to substantially increase horsepower and torque in boosted applications. Both versions retain the use of stock sensors and fittings. Cylinder heads are available fully assembled or as bare castings. Sold individually.
Dyno Results GenX 185
Test Engine: 10.42:1 compression 350 c.i.d. with Trick Flow GenX® 185 cylinder heads (TFS-30410008-M54), Trick Flow Track Max® hydraulic roller camshaft (TFS-31402081), Trick Flow 1.6 ratio roller rocker arms (TFS-31400513), stock GM intake manifold and 52mm throttle body, Hooker Super Competition headers with 13⁄4" primaries, 3" dual exhaust with Flowmaster mufflers.
GenX 185 and 195 Heads, Fast As Cast Runners, Assembled
GM LT1
TFS-30410008-M54 TFS-30410010
Naturally aspirated engines, 21° valve angle, 185cc intake runners Forced induction engines, 23° valve angle, 195cc intake runners
Airflow Results GenX 185
Lift Value .100" .200" .300" .400" .500" .600"
Intake Flow CFM 65 132 195 236 258 260
Exhaust Flow CFM 48 111 151 182 198 206
Tests conducted at 28" of water (pressure). Bore size: 4.030"; exhaust with 13⁄4" pipe.
Airflow Results GenX 195
Lift Value .100" .200" .300" .400" .500" .600"
Intake Flow CFM 51 136 191 230 253 254
Exhaust Flow CFM 58 98 136 163 177 190
TFS-30410008-M54
Specifications Material: A356-T61 aluminum Combustion Chamber Volume: M54: 54cc CNC-profiled 10: 62cc standard Intake Port Volume: M54: 185cc Fast As Cast 10: 195cc Fast As Cast Intake Port Location: Stock Intake Port Dimensions: M54: 1.220" x 2.120" 10: 1.280" x 2.090" Intake Gaskets: Fel-Pro 1284 Intake Valve Diameter: 2.020" (TFS-51400211) Intake Valve Seat: M54: Ductile iron (TFS-30300271) 10: Tungsten alloy (TFS-51400271) Exhaust Port Volume: M54: 67cc Fast As Cast 10: 72cc Fast As Cast Exhaust Port Location: Stock Exhaust Port Dimensions: 1.350" x 1.450" D-shape Exhaust Gaskets: Fel-Pro 1404 Exhaust Valve Diameter: 1.600" (TFS-51400212) Exhaust Valve Seat: M54: Ductile iron (TFS-30300272) 10: Tungsten alloy (TFS-51400272) Valve Angles: M54: 21° 01: 23° Valve Guide Material: Bronze alloy (TFS-51400252) Valve Seals: Viton® fluoroelastomer (TFS-51400454) Valve Seat Angles: 45° x multi-angle Valve Spring Pocket Diameter: M54: 1.615" 10: 1.615"; 1.500" for two center valve springs Valve Spring Cups: M54: 1.280" (TFS-31400433) 10: 1.500" (TFS-51400434) Valve Spring Retainers: 7° x 1.250" o.d. chromoly steel (TFS-31400423) Valve Stem Locks: 7° steel (TFS-51400444) Valve Springs: M54: 1.300" o.d. dual spring with damper (TFS-16306-16) 150 lbs. @ 1.800" installed height 450 lbs. @ 1.200" open 448 lbs. per inch rate .600" maximum valve lift 10: 1.460" o.d. dual spring with damper (TFS-16315-16) 125 lbs. @ 1.800" installed height 376 lbs. @ 1.180" open 420 lbs. per inch rate .600" maximum valve lift Guideplates: M54: 5/16" (TFS-30400624-8) 10: 5/16" (TFS-30400623-8) Rocker Arm Studs: 3/8" (TFS-51400613) Rocker Arms: TFS-31400512 (1.5 ratio, 3/8" studs) TFS-31400513 (1.6 ratio, 3/8" studs) TFS-31400514 (1.5 intake/1.6 exhaust ratio, 3/8" studs) Minimum Bore Diameter: 4.000" Cylinder Head Bolts: TFS-92000 Head Gaskets: TFS-30494040-040 Pushrod Length: Longer than stock required Spark Plugs: M54: NGK 4177 or 3403 10: NGK FR5 or Autolite 3924 NOTE: TFS-30400008-M54 includes LT1 and LT4 intake gasket alignment holes. Viton® is a registered trademark of DuPont Performance Elastomers.
Tests conducted at 28" of water (pressure). Bore size: 4.030"; exhaust with 13⁄4" pipe.
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Some parts are not legal for use in California or other states with similar laws/regulations—see page 2 for details. Phone: 1300 350 351
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