Skip to content
LS1 Extreme Duty Asymmetrical FSR Flat Top Forged Piston J321242

LS1 Extreme Duty Asymmetrical FSR Flat Top Forged Piston J321242

J321242 - LS1 3.905" PISTONS -20cc DISH
SKU J321242
by JE
$1,760.85 +GST - $1,760.85 +GST
$1,760.85 +GST
$1,760.85 +GST
$1,760.85 +GST - $1,760.85 +GST
$1,760.85 +GST
$2024.9775 Including GST (NZ Customers only)
Availability:
Low stock
LS1 Extreme Duty Asymmetrical FSR Flat Top Forged Piston

3.905" bore, 3.622" stroke, 6.125" rod length, -20.2cc dome volume

J321242

21242

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: Pin #927-2250-15-51C (106g) Round Wire Locks # 927-073-MW Features: High strength FSR forging Accumulator Grooves Double Pin Oilers Offset Wrist Pin Piston Specifications Make: CHEVROLET Engine: CHEVROLET LS GEN III/IV Bore Diameter: 3.905 Compression Height: 1.315 Compression Ratio with 64cc chamber volume: 8.7 Compression Ratio with 66cc chamber volume: 8.5 Compression Ratio with 72cc chamber volume: 8.0 Piston Volume: -20.2 Cylinder Head: LSX/L92 12 DEG Piston Pin Outside Diameter: 0.927 Piston Pin Length: 2.250 Piston Pin Material: 5115 Ringset Included: No Top Compression Ring Thickness: 0.06 Second Compression Ring Thickness: 0.06 Oil Ring Thickness: 0.1175 Piston Material: 2618 Forging Type: FSR Piston Avg Weight: 421 Pin Wall Thickness: 0.170 Piston Type: Dish