- Keith Black Performance Pistons are offered in Hypereutectic 390 alloy and Forged 4032 low expansion alloy. Their 4032 alloy is preferred for high performance / high compression applications. They offer offset wrist pins for a quiet engine and most have coated skirts. The low expansion alloy allows for a tighter piston to wall running clearance.
Compression Ratio with 62cc Heads 14.9:1
Compression Ratio with 64cc Heads 14.5:1
Advertised piston weight 484 grams, 145 gram wrist pin.
SKU KB375-STD Manufacturer Keith Black Vehicle Make Chevy SB Bore Size 4.125 Wrist Pin Size 0.927 Piston Material Hypereutectic Compression Height 1.130 Piston Ring Size 1/16 1/16 3/16 Piston Type Dome +11cc Rod Length 6.000 Crankshaft Stroke 3.750 List price No