Compatible with stock cylinders and heads, gives stock compression ratio. 8.5:1 CR. Piston weight 370gr. Piston pin weight 97gr. Head type: Dome 0.656" / Dome -57cc. Compression height 1.450". Bore 3.4375" / Stroke 3.969" (3-31/32"). Rod length 7.440" / Cyl. length 5.330". Comes with T6 heat treated 390 Hypereutectic cast pistons with 16% silicone levels which enables running a very tight clearance for longevity and hardly any piston noise. Note: Top compression ring will need additional clearance. See instructions.
Fits: > 41-78 74"/1200cc Knuckle, Pan, Shovel (NU)
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