Diamond 12957 Forged Pro-Filer Hitman 12 Degree Dome Pistons 4.625 Bore

Forged Diamond Dome Pistons for Pro-Filer "Hitman" 12 Degree Series Cylinder Heads. .043 .043 3/16 ring land with added gas ports for maximum ring seal. Compression ratios figured for .005" to .020" deck height @ 9.800" and 10.200" figured with 11.3cc gasket volume. Top ring moved down from piston crown .340". Valve relief depths .310" intake and .098" exhaust. Premium H-13 Tool Steel wrist pins are included.

Compression Ratio with 64cc Heads 15.6:1
Compression Ratio with 72cc Heads 14.4:1

Additional Information

SKU	DRP-12957
Manufacturer	Diamond
Vehicle Make	Chevy BB
Bore Size	4.625
Wrist Pin Size	0.990
Piston Material	2618 Forged
Compression Height	1.120
Piston Ring Size	.043 .043 3/16
Piston Type	Dome +10cc
Rod Length	6.700
Crankshaft Stroke	4.750
List price	No