What material are these pistons made from?

These pistons are forged 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 helps minimize friction and power loss. It achieves this through a reduced skirt width and the use of a shorter wrist pin, which also contributes to saving weight.

Are these pistons legal for use in California?

No, these pistons are not CARB approved and cannot be shipped to California due to emissions regulations.

JE Pistons Forged Piston Set 311999 - LS Engines

Name: JE Pistons LS ASYM FT 4.100STRK Set of 8 Pistons
Brand: JE Pistons
SKU: je-pistons-je-pistons-ls-asym-ft-4-100strk-set-of-8-pistons-t14-296228
Price: 975.74 USD
Availability: BackOrder

JE Pistons LS ASYM FT 4.100STRK 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 FT 4.100STRK Set of 8 Pistons. Forged in the USA for high-demand LS engine builds.

Key Features

Fits LS engines with a 4.130 inch bore.
Set includes 8 forged pistons.
Forged in the USA from 2618 aluminum for high tensile strength.
Features JE Pistons' proprietary Forged Side Relief (FSR) design to minimize friction and power loss.
Includes a 0.927 inch wrist pin.
Flat top piston design with a 1.065 inch compression distance and a -5.00 cc volume.

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Product Details

JE Pistons is known for making well-built forged racing pistons, with over 75 years of experience. They've applied that knowledge to this set of LS ASYM FT pistons, designed for high-demand performance applications. These pistons are forged and machined 100% in the USA from 2618 aluminum, giving them the strong tensile strength needed for serious engine builds.

This set features a flat top design with a 4.130-inch bore and a 1.065-inch compression distance, using a 0.927-inch wrist pin. JE's proprietary Forged Side Relief (FSR) design helps minimize friction and power loss by reducing skirt width, and the shorter wrist pin also saves 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. A skirt coating, also application-dependent, further reduces friction and wear on the piston skirts and cylinder walls, while also cutting down on operating noise.

This is a complete set of 8 pistons, engineered specifically for LS engines to provide an optimized combination of performance and durability. Please note that these pistons are not CARB approved and cannot be shipped to California.