inc. GST

SKU: J321239

BRAND: JE Pistons

LS1 Extreme Duty FSR Flat Top Forged Piston
3.898" bore, 3.622" stroke, 6.098" rod length, .945" Pin, -2.0cc dome volume

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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.


  • .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

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