JE Pistons specially designed for the latest aftermarket blocks and heads, JE pistons are for use with the aftermarket 4.250? crank and aftermarket 6.700? rods. The factory block should be sonic checked for 4.280? and 4.310? bores. These pistons use 1/16, 1/16, 3/16 rings. The compression ratios are figured for 10.150 block height. Larger bore sizes available as customs, call JE for details. Note: Does not work with OEM Connecting Rods. Designed for Aftermarket Connecting Rods only.

Includes:

Pin#990-2930-15-51S (150g)

Double spiro locks (#990-042-CS)

Compression Ratio:

72cc 12.5:1

74cc 12.3:1

88cc 10.8:1