- These big block pistons are compatible with forced induction, nitrous and angle milled heads. The inverted dome shape has been designed for maximum efficiency and horsepower. Valve reliefs will accommodate oversized valves and long duration, tight lobe separation cams. Compression Height figured using 9.780 block height with zero deck clearance. Precision CNC machined ring grooves accept 1/16, 1/16, 3/16 rings. Will fit both open and closed chamber cylinder heads. Pin #990-2930-18-51S (174g), and double spiro locks #990-042-CS are included.
Compression Ratio with 118cc Heads 7.6:1
Compression Ratio with 124cc Heads 7.4:1
SKU JE-257947_1 Manufacturer JE Vehicle Make Chevy BB Bore Size 4.500 Wrist Pin Size 0.990 Piston Material 2618 Forged Compression Height 1.395 Piston Ring Size 1/16 1/16 3/16 Piston Type Inverted Dome -28cc Rod Length 6.385 Crankshaft Stroke 4.000 List price No