What material are these JE Pistons made from?

These pistons are forged from 2618 aluminum. This material is chosen for its high tensile strength, making it suitable for high-demand performance applications.

Are these pistons compatible with all LS1 engines?

These pistons are designed specifically for the GM LS1 engine. However, it's always recommended to verify compatibility with your specific engine build and connecting rod length, as they are intended for use with a 6.125-inch rod.

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

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

JE Pistons Forged Piston Set 321244 - GM LS1

Name: JE Pistons GM LS1 FT 6.125in Rod 3.905in Bore -2cc Dish - Set of 8
Brand: JE Pistons
SKU: je-pistons-je-pistons-gm-ls1-ft-6-125in-rod-3-905in-bore-2cc-dish-set-of-8-t14-199885
Price: 718.98 USD
Availability: BackOrder

JE Pistons GM LS1 FT 6.125in Rod 3.905in Bore -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. Built in the USA for high-demand performance.

Key Features

Fits GM LS1 engines.
Forged in the USA using 2618 aluminum for high tensile strength.
Proprietary Forged Side Relief (FSR) design minimizes friction and power loss.
Features a -2cc dish for optimized compression.
Includes a 0.927-inch pin and a 3.905-inch bore.
Designed specifically for each engine and use application.

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Product Details

If you're rebuilding the heart of your GM LS1 engine for serious performance, a set of forged pistons is a critical component. These JE Pistons are crafted from 2618 aluminum, a material chosen for its high tensile strength, which is essential when you're pushing your engine hard. They're designed specifically for the LS1 engine, ensuring they work well with its unique characteristics for optimized durability and performance.

JE Pistons brings over 75 years of experience to the table, and these pistons are forged and machined entirely in the USA. They feature a proprietary Forged Side Relief (FSR) design, which helps reduce friction and power loss by using a narrower skirt and a shorter wrist pin, saving weight in the process. Depending on the specific application, these pistons may also include an accumulator groove to help manage combustion gas pressure, leading to better ring seal and consistent power. A skirt coating, if included, further reduces friction and wear on the piston skirts and cylinder walls, contributing to a quieter operation and longer life.

This set includes eight pistons, each with a 3.905-inch bore and a -2cc dish, designed to work with a 6.125-inch connecting rod. It's important to note that these pistons are not CARB approved and cannot be shipped to California. For a high-performance engine build, these JE Pistons offer a well-built foundation.