What material are these pistons made from and why is it important?

These pistons are forged from 2618 aluminum. This material is chosen for its high tensile strength, which is essential for components that will experience high stress and heat in performance engine builds.

What is the Forged Side Relief (FSR) design?

The FSR design is a proprietary forging from JE Pistons. It helps reduce friction and power loss by using a narrower skirt and a shorter wrist pin, which also contributes to saving weight.

Are these pistons compatible with all LS engine builds?

These pistons are specifically designed for LS engines with a 4.125 inch bore. While they are built for high-demand applications, it's always recommended to verify compatibility with your specific engine configuration and build goals.

JE Pistons Forged Piston Set 312100 - LS 4.125in Bore

Name: JE Pistons LS ASYM DOME Set of 8 Pistons
Brand: JE Pistons
SKU: je-pistons-je-pistons-ls-asym-dome-set-of-8-pistons-t14-296279
Price: 975.74 USD
Availability: BackOrder

JE Pistons LS ASYM DOME Set of 8 Pistons

$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 Set of 8 Pistons. Forged from 2618 aluminum for high-demand LS engine builds.

Key Features

Fits LS engines with a 4.125 inch bore.
Set includes 8 forged pistons.
Constructed from 2618 aluminum for high tensile strength.
Features a proprietary Forged Side Relief (FSR) design to minimize friction and power loss.
Includes an accumulator groove (application dependent) for improved ring seal.
Piston skirt coating (application dependent) reduces friction and wear.

This piston set is designed for LS engines with a 4.125 inch bore. Please consult manufacturer specifications for complete compatibility details.

Secure CheckoutFast Shipping631-982-0042

Product Details

If you're rebuilding or upgrading an LS engine for serious performance, a strong set of pistons is where it all starts. This set of eight asymmetrical dome pistons from JE Pistons is built to handle the rigors of high-demand applications, whether you're hitting the drag strip or pushing your engine hard on the track. They're forged in the USA from 2618 aluminum, a material known for its high tensile strength, which is crucial when you're looking for durability under extreme conditions.

JE Pistons brings over 75 years of experience to the table with these components. They feature a proprietary Forged Side Relief (FSR) design, which helps minimize friction and power loss by reducing skirt width and using a shorter wrist pin for weight savings. Depending on the specific application, you might also find an accumulator groove to help control combustion gas pressure, leading to better ring seal and more consistent power delivery. Some applications also include a skirt coating that reduces friction and wear on the piston skirts, which can also help quiet down engine noise.

These pistons are designed specifically for the LS engine and the intended use, aiming for an optimized balance of performance and durability. Everything is manufactured 100% in the USA, ensuring a well-built product. Keep in mind that this kit is not CARB approved and cannot be shipped to California. You'll also want to check the manufacturer's instructions for any specific installation requirements, as these are high-performance components designed for custom builds.