BIG BLOCK CHEVY CAST ALUMINUM CYLINDER HEADS 24° 345cc

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Maximum street or marine performance, bracket racing, heads up and super classes. Over 7,000 RPM, 540+ cubic inches.

The PRO1 24° 345cc cylinder head is for uncompromising performance and racing applications which favor high RPM power over low end flexibility. Best for big cubic inch, high RPM use.

Rolled valve angles, improved spark plug location, extra-long intake valves, raised exhaust ports, and fast burn chambers. Works with off the shelf pistons, valve train components, and intake manifolds.

Long wearing Bronze valve guides, screw-in studs, multi-angle intake seats with hardened, radiused exhaust seats are standard.

Assemblies include Stainless Steel valves, premium springs, locks, retainers, guide plates and seals.

Uses +.250” long intake valves.

Heads are sold individually.

DART MARINE PRO1 CYLINDER HEADS

Features an exclusive Teflon© surface finish to inhibit corrosion and extend the life of the head.

Fitted with Inconel exhaust valves to withstand the extended running time and temperatures typical of marine usage.

Head parts kit - see page 107.

Uses +.250” long intake valves.

RECOMMENDED

PRO1 24° 345 cc SPECS

Material: RMR Cast Aluminum Alloy

Valve Angle: 24°

Intake Port Volume: 345cc

Intake Valve: 2.300”

Exhaust Valve: 1.880”

Chamber Volume: 121cc

Intake

FLOW DATA @ 28” WATER

24° 525 MMR 310/325/345cc

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Mercury Racing 525 replacement style heads. Three intake runner sizes offer potential for increased levels of performance.

We’ve retooled Dart’s PRO1 BBC castings to produce a true bolt on upgrade for the Mercury Racing 525 engine. The PRO1 24° 525 MMR is available with 310cc, 325cc or 345cc intake runners and has the correct exhaust bolt pattern for the factory manifolds. A grey chromate surface treatment inhibits salt corrosion for marine usage.

Uses +.250” long intake valves.

Heads are sold individually.