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

The FSR design minimizes friction and power loss by using a reduced skirt width. It also saves additional weight with a shorter wrist pin, contributing to overall engine efficiency.

Are these pistons compatible with all LS engines?

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

What does it mean that these pistons are not CARB approved?

Not being CARB approved means these pistons do not meet California Air Resources Board emissions standards. Therefore, they cannot be legally shipped to or installed in California.

JE Pistons Forged Piston Set 312128 - LS Engines

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-t14-296299
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 with a 4.125 inch bore.
Set includes 8 forged pistons.
Constructed from 2618 aluminum for high tensile strength.
Features JE Pistons' proprietary Forged Side Relief (FSR) design to minimize friction and save weight.
May include an accumulator groove to improve ring seal and reduce ring flutter.
May include a skirt coating to reduce friction and wear, and lower operating noise.

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Product Details

JE Pistons has been a leader in forged racing pistons for over 75 years, known for applying their experience to domestic engine applications. This set of LS ASYM DM 4100STRKR pistons is a prime example of their commitment to durability and performance, engineered specifically for high-demand LS engines. They are forged and machined entirely in the USA, ensuring a high standard of quality for serious builds.

These pistons are constructed from 2618 aluminum, a material chosen for its high tensile strength, which is crucial for engines pushing the limits. They feature JE Pistons' proprietary Forged Side Relief (FSR) design, which uses a reduced skirt width and a shorter wrist pin to minimize friction and power loss while also saving weight. Depending on the specific application, these pistons may also include an accumulator groove to help reduce combustion gas pressure, preventing ring flutter and improving ring seal for consistent power delivery. Some applications also benefit from a skirt coating that further reduces friction and wear on the piston skirts and cylinder walls, contributing to quieter operation.

This set is designed for a 4.125 inch bore and includes all eight pistons, along with the necessary components for installation. It's important to note that these pistons are not CARB approved and cannot be shipped to California. For those building a high-performance LS engine, this set offers a well-built option with proven performance.