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

These pistons are forged from 2618 aluminum. This material is chosen because it offers high tensile strength, which is essential for handling the extreme pressures and temperatures found in high-demand performance engines.

What is the Forged Side Relief (FSR) design?

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

Are these pistons compatible with all LS engine builds?

While designed for LS engines, specific bore size, compression distance, and pin diameter are critical. This set is for a 4.005-inch bore with a 1.065-inch compression distance and a 0.927-inch pin. Always verify these dimensions against your engine's requirements.

JE Pistons Forged Piston Set 312121 - LS Engine

Name: JE Pistons LS ASYM DM 4100STRKR Set of 8 Pistons
Brand: JE Pistons
SKU: je-pistons-je-pistons-ls-asym-dm-4100strkr-set-of-8-pistons-t14-296294
Price: 975.74 USD
Availability: BackOrder

JE Pistons LS ASYM DM 4100STRKR 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 DM 4100STRKR Set of 8 Pistons. Forged in the USA from 2618 aluminum for high-demand performance.

Key Features

Fits LS engines.
Set includes 8 pistons.
Forged in the USA using 2618 aluminum for high tensile strength.
Features proprietary Forged Side Relief (FSR) design to minimize friction and power loss.
Designed specifically for each engine and use application for optimized performance and durability.
May include accumulator groove to reduce combustion gas pressure and improve ring seal.

This piston set is designed for LS engines. Always check manufacturer specifications to confirm compatibility with your specific engine build.

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Product Details

JE Pistons has been a leader in forged racing pistons for over 75 years, and they've applied that experience to their line of forged pistons for domestic engines. These LS ASYM DM 4100STRKR pistons are engineered, forged, and machined entirely in the USA, specifically for your LS engine and its intended use, aiming for the best balance of durability and performance. They're proven in racing, from dirt tracks to drag strips, and are a solid choice when you need top-tier forged pistons for your build.

These pistons are made from 2618 aluminum, which offers the high tensile strength needed for high-demand performance applications. They feature JE Pistons' proprietary Forged Side Relief (FSR) design, which helps minimize friction and power loss by using a reduced skirt width and a shorter wrist pin, saving weight. Depending on the specific application, these pistons may also include an accumulator groove to reduce combustion gas pressure, which helps prevent ring flutter and improves ring seal for consistent power. Additionally, a skirt coating, if included for your application, further reduces friction and wear on the piston skirts and cylinder walls, while also helping to quiet down engine noise.

This set includes eight pistons, each designed for a 4.005-inch bore with a 1.065-inch compression distance and a 0.927-inch wrist pin. Please note that these pistons are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly details.