We have redesigned and expanded our GM LS1 series product lines! These new pistons utilized our dedicated Forged Side Relief (FSR) forging that was specifically designed for the demands of the GM LS1 series of engines. In addition we have found ways to reduce weight and maintain the durability needed for both street and racing use. (CR calculated with .051? gasket thickness and +.009-.011? deck clearance). Lightweight and extremely durable, these pistons are machined for 1.5mm, 1.5mm, 3.0mm rings.

Includes:

927-2250-15-51C (106g) wrist pins

Wire locks included, #945-073-MW

Compression Ratio:

64cc 11.5:1

66cc 11.3:1

72cc 10.5:1