JE Pistons are machined by the most advanced CNC machining technologies available. JE forged Pistons are trusted by racers and engine builds for dependability. JE has 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:

Pin #927-2250-15-51C (106g)

Wire Locks #945-073-MW

Compression Ratio:

64cc 10.5:1

66cc 10.3:1

72cc 9.7:1