JE Pistons GM LS1 FT 6.125in Rod 3.905in Bore -20.2cc Dish - Set of 8

SKU: JEP321242

Pistons

JE Piston Sets -8 Cyl...

JE Pistons

JE Pistons GM LS1 FT 6.125in Rod 3.905in Bore -20.2cc Dish - Set of 8

SKU: JEP321242

Pistons

JE Piston Sets -8 Cyl...

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Description

JE Auto forged pistons from JE Pistons are the result of over 75 years of industry leading experience extended to our range of premium forged pistons for GM LS Gen III/IV Engines JE Pistons are designed for each specific engine and racing application to provide the ultimate combination of durability and performance. From drift track to drag strip, JE Pistons’ performance is proven in victory lane time and time again. Equipped with the following custom level features

Application Summary

Chevrolet LS1

Part Type

Engine Piston Kit

Data: v4.2 - Upd: 2026-10-13 21:37:09

Features

Accumulator Groove: A specialty groove between the top and second ring provides added volume for blow-by gases. This helps reduce pressure between the rings, improving top ring seal and minimizing ring flutter at high cylinder pressures.
Designed specifically for GM LS Gen III/IV Engines To provide optimized performance durability
Forged in the USA using 2618 aluminum, yielding high tensile strength needed for high-demand performance applications
Includes high-quality wrist pins, and locks
Made 100% in the USA
Pin Fit: The pin bore is precision honed to attain an exact pin clearance. Clearances typically range from .0003 to .0010 between the wrist pin and pin bore.
Proprietary Forged Side Relief (FSR) forging design minimizes friction and power loss with reduced skirt width and saves additional weight with a shorter wrist pin
Skirt Coat: Skirt Coat reduces friction and wear on piston skirts and cylinder walls while simultaneously reducing operating noise

Specifications

Product Attributes - Brand: JE Pistons
Product Attributes - Manufacturer's Part Number: 321242
Product Attributes - Part Type: Pistons
Product Attributes - Product Line: JE Pistons LS1/LS6/Z06/5.7L/6.0L FSR Pistons
Product Attributes - UPC: 193564030207
Product Attributes - Piston Rings Included: No
Product Attributes - Bore (in.): 3.905 in.
Product Attributes - Bore (mm): 99.187mm
Product Attributes - Stroke: 3.622 in.
Product Attributes - Engine Stroke Type: Stock
Product Attributes - Rod Length: 6.125 in.
Product Attributes - Piston Style: Dish, with two valve reliefs
Product Attributes - Piston Material: Forged aluminum
Product Attributes - Compression Height (in.): 1.315 in.
Product Attributes - Piston Head Volume (cc): +20.20cc
Product Attributes - Wrist Pin Style: Press-fit or floating
Product Attributes - Wrist Pin Retainers Included: Yes
Product Attributes - Wrist Pin Included: Yes
Product Attributes - Pin Diameter (in.): 0.927 in.
Product Attributes - Piston Ring Thickness: 1.50mm x 1.50mm x 3.00mm
Product Attributes - File Fit: No
Product Attributes - Gapless: No
Product Attributes - Remanufactured: No
Product Attributes - Quantity: Sold as a set of 8.

Reference Information

Brand Name/s	JE Pistons
StreetFX SKU	jep321242
SFX Item ID	4361183
Supplier Item Code	4361183
Manufacturer SKU	321242
Manufacturer UPC	193564030207
Alternative References	JEP-321242-8, LS1, 6.125in, 3.905in, -20.2cc