- 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 82cc Heads 9.9:1
Compression Ratio with 91cc Heads 9.2:1
Advertised piston weight 750 grams, 166 gram wrist pin.
SKU KB206-040 Manufacturer Keith Black Vehicle Make Ford BB Bore Size 4.400 Wrist Pin Size 1.04 Piston Material Hypereutectic Compression Height 1.772 Piston Ring Size 5/64 5/64 3/16 Piston Type Dish -15cc Rod Length 6.605 Crankshaft Stroke 3.850 List price No