JE Pistons feature a completely new design configuration that will accommodate intake valve diameters of up to 2.250?. Valve reliefs have been machined to accept long duration, tight lobe separation cam profiles and ring grooves are machined for 1/16, 1/16, 3/16 rings. These pistons are available with either .990? or 1.094? diameter wrist pins (see footnotes).

Includes:

990-2930-15-51S (150g) pins

990-042-CS double spiro locks

Compression Ratio:

73cc 12.5:1

80cc 11.7:1

90cc 10.7:1