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 crucial for high-demand performance engine applications.

Are these pistons compatible with all LS engines?

These pistons are specifically designed for LS engines with a 3.9-inch stroke and a 4.125-inch bore. It's important to verify these specifications match your engine build for proper fitment.

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

The proprietary Forged Side Relief (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 324017 - LS Engine

Name: JE Pistons LS Asym Dome 3.9in Stroke 4.125 Bore 5.7 Dome Volume - Set of 8
Brand: JE Pistons
SKU: je-pistons-je-pistons-ls-asym-dome-3-9in-stroke-4-125-bore-5-7-dome-volume-set-o-t14-340549
Price: 975.74 USD
Availability: BackOrder

JE Pistons LS Asym Dome 3.9in Stroke 4.125 Bore 5.7 Dome Volume - Set of 8

$975.74

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 LS Asym Dome 3.9in Stroke 4.125 Bore 5.7 Dome Volume - Set of 8. Forged in the USA from 2618 aluminum for high-demand performance.

Key Features

Set of 8 forged pistons for LS engines.
Forged in the USA from 2618 aluminum for high tensile strength.
Asymmetrical dome design with 5.7cc volume.
4.125 inch bore size.
Features a proprietary Forged Side Relief (FSR) design to minimize friction and power loss.
May include an accumulator groove to improve ring seal and reduce flutter.

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Product Details

Forged in the USA from 2618 aluminum, these JE Pistons are built to handle the high tensile strength required for demanding performance applications. They feature an asymmetrical dome design, a 4.125-inch bore, and a 5.7cc dome volume, specifically tailored for LS engines with a 3.9-inch stroke. This set includes eight pistons, designed to optimize both durability and performance for your build.

JE Pistons brings over 75 years of experience to their forged racing pistons, and these are no exception. They incorporate a proprietary Forged Side Relief (FSR) forging design, which helps minimize friction and power loss by reducing skirt width. This design also saves weight with a shorter wrist pin. Depending on the specific application, these pistons may also include an accumulator groove to reduce combustion gas pressure, preventing ring flutter and improving ring seal for consistent power delivery. A skirt coating, also application-dependent, further reduces friction and wear on the piston skirts and cylinder walls, contributing to quieter operation.

These pistons are 100% made in the USA, ensuring a high level of manufacturing control. They are designed specifically for each engine and use application, aiming for optimized performance and longevity. Please note that this part is not CARB approved and cannot be shipped to California.