JE Pistons specially designed for the latest aftermarket blocks and heads, JE pistons are for use with the 427 or the 428 crank and aftermarket 4.250? crank with aftermarket 6.700? rod. 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. 242930, 242931, & 242932 designed for aftermarket connecting rod only.

Includes:

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

Double spiro locks (#990-042-CS)

Compression Ratio:

72cc 10.2:1

74cc 10.1:1

88cc 9.0:1