What material are these pistons made from?

These pistons are forged in the USA from 2618 aluminum. This material is chosen for its high tensile strength, which is necessary for high-demand performance applications.

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 contributes to weight savings, partly due to a shorter wrist pin.

Are these pistons compatible with all LS engines?

This set is designed specifically for LS engines with a 4.155 inch bore. It's important to verify that this bore size and the specific LS engine application match your needs. Note that these are not CARB approved and cannot be shipped to California.

JE Pistons LS ASYM DM 4000STRKR Piston Set 312116

Name: JE Pistons LS ASYM DM 4000STRKR Set of 8 Pistons
Brand: JE Pistons
SKU: je-pistons-je-pistons-ls-asym-dm-4000strkr-set-of-8-pistons-t14-296292
Price: 975.74 USD
Availability: BackOrder

JE Pistons LS ASYM DM 4000STRKR 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 4000STRKR Set of 8 Pistons. Forged in the USA from 2618 aluminum for high-demand performance.

Key Features

Fits 8-cylinder LS engines with a 4.155 inch bore.
Forged in the USA from 2618 aluminum for high tensile strength.
Proprietary Forged Side Relief (FSR) design minimizes friction and power loss.
Reduced skirt width and shorter wrist pin contribute to weight savings.
Dome volume is -0.20 cc, with a 1.115 inch compression distance.
Includes 0.927 inch wrist pins.

This piston set is designed for 8-cylinder LS engines. Not CARB approved and cannot ship to California.

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Product Details

Forged in the USA from 2618 aluminum, these JE Pistons LS ASYM DM 4000STRKR pistons are built for high-demand performance applications. They feature a proprietary Forged Side Relief (FSR) design that cuts down on friction and power loss by using a reduced skirt width. This design also saves weight thanks to a shorter wrist pin. Depending on the specific application, these pistons may also include an accumulator groove to help manage combustion gas pressure, which reduces ring flutter and leads to a more consistent ring seal. Some applications also benefit from a skirt coating that further reduces friction and wear on the piston skirts and cylinder walls, while also cutting down on operating noise.

JE Pistons has been a leader in forged racing pistons for over 75 years, and this set is a testament to that experience. Each piston is engineered, forged, and machined in the USA, specifically for the LS engine and its intended racing use. This ensures an optimized combination of durability and performance, whether you're on the dirt track or the drag strip. The dome design is specific to this application, with a volume of -0.20 cc, and the bore size is 4.155 inches. The compression distance (CD) is 1.115 inches, and the wrist pin diameter is 0.927 inches. This kit includes all 8 pistons needed for a V8 engine.

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.