What material are these JE Pistons made from?

These pistons are forged from 2618 aluminum. This material is chosen for its high tensile strength, which is necessary for high-performance engine applications.

What is the purpose of the Forged Side Relief (FSR) design?

The FSR design helps to minimize friction and power loss. It achieves this by using a reduced skirt width and a shorter wrist pin, which also contributes to saving weight.

Are these pistons compatible with all LS1 engines?

These pistons are specifically designed for GM LS1 engines and are intended for performance applications. They feature a 3.905-inch bore and are designed to work with a 6.125-inch connecting rod. It's always recommended to verify compatibility with your specific engine build and other components.

JE Pistons Forged Piston Set 321242 - GM LS1

Name: JE Pistons GM LS1 FT 6.125in Rod 3.905in Bore -20.2cc Dish - Set of 8
Brand: JE Pistons
SKU: je-pistons-je-pistons-gm-ls1-ft-6-125in-rod-3-905in-bore-20-2cc-dish-set-of-8-t14-31821
Price: 718.98 USD
Availability: BackOrder

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

$718.98

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

JE Pistons forged piston set for GM LS1 engines. Made in the USA from 2618 aluminum for high-demand performance.

Key Features

Fits GM LS1 engines and is designed for high-demand performance applications.
Forged in the USA using 2618 aluminum for high tensile strength.
Features a 3.905-inch bore and a -20.2cc dish for setting compression ratio.
Designed to work with a 6.125-inch connecting rod.
Includes proprietary Forged Side Relief (FSR) forging design to minimize friction and power loss.
May include an accumulator groove to reduce combustion gas pressure and improve ring seal.

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Product Details

If you're rebuilding the heart of your GM LS1 engine for serious performance, a set of high-strength forged pistons is a critical component. These JE Pistons are built to handle the demands of high-horsepower applications, offering a solid foundation for your build. They are designed to work with a 6.125-inch connecting rod and feature a 3.905-inch bore with a -20.2cc dish, which is important for setting your compression ratio.

JE Pistons has been making performance pistons for over 75 years, and these are forged and machined entirely in the USA from 2618 aluminum. This material choice gives them the high tensile strength needed for demanding engine builds. They also incorporate JE's proprietary Forged Side Relief (FSR) design, which helps reduce friction and power loss by using a shorter wrist pin and narrower skirt. Depending on the specific application, these pistons may also feature an accumulator groove to help reduce combustion gas pressure, improving ring seal, and a skirt coating to cut down on friction and noise.

This is a complete set of 8 pistons, ready to be installed in your LS1 engine. Please note that these pistons are not CARB approved and cannot be shipped to California.