LS1 Extreme Duty FSR Flat Top Forged Piston 321239 J321239 3.898" bore, 3.622" stroke, 6.098" rod length, .945" Pin, -2.0cc dome volume LS1 3.898" PISTONS -2cc DISH 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 high output GM LS1 series engines. In addition we have found ways to reduce weight and maintain the durability needed for both street and racing use. Lightweight and extremely durable, these pistons are machined for 1.5mm, 1.5mm, 3.0mm rings. wrist pin upgrade recommended above 800hp.

Includes:

.945 x 2.250 straight wall carbon steel wrist pin

Wire locks

Specifications

:

Part #: J321239

Bore: 3.898"

Oversize: STD

Stroke: 3.622

Rod Length: 6.098"

Compression Height: 1.340"

Compression Ratio with 64cc chamber volume: 10.4

Compression Ratio with 66cc chamber volume: 10.2

Compression Ratio with 72cc chamber volume: 9.6

Dome Volume: -2.0cc

Gram Weight: 437

Footnote: Forged Side Relief / Forced Induction

Reconmended Ring Set: J68008-3900-3