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 crucial for handling the extreme pressures and temperatures found in high-performance and racing engines.

What is the Forged Side Relief (FSR) design?

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

Are these pistons compatible with all LS engines?

While designed for LS engines and featuring a 4.155 inch bore, these are a universal piston set. It's important to confirm that the bore size, piston pin dimensions, and compression height (-5.00 cc) are compatible with your specific engine build and desired compression ratio.

JE Pistons LS ASYM FT 4100STRKR Piston Set 312001

Name: JE Pistons LS ASYM FT 4100STRKR Set of 8 Pistons
Brand: JE Pistons
SKU: je-pistons-je-pistons-ls-asym-ft-4100strkr-set-of-8-pistons-t14-296230
Price: 975.74 USD
Availability: BackOrder

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

Key Features

Fits 8-cylinder engines with a 4.155 inch bore.
Forged in the USA using 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.
Flat top piston design.
Includes 8 pistons.

This is a universal piston set designed for 8-cylinder engines with a 4.155 inch bore. Please verify compatibility with your specific engine build.

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Product Details

JE Pistons is known for making strong, forged racing pistons, and they've put over 75 years of experience into this LS ASYM FT 4100STRKR piston set. These aren't just generic pistons; they're built specifically for high-demand performance applications, especially for LS engines. They're engineered, forged, and machined entirely in the USA, using 2618 aluminum, which gives them the high tensile strength you need when you're pushing your engine hard, whether that's on the track or the street.

What sets these apart is the attention to detail. They feature a proprietary Forged Side Relief (FSR) design that helps minimize friction and power loss by using a reduced skirt width and a shorter wrist pin, which also saves weight. Depending on the specific application, you might also find an accumulator groove, which helps control combustion gas pressure to prevent ring flutter and keep your rings sealed for consistent power. Some applications also include a skirt coating designed to cut down on friction and wear, making your engine run quieter and last longer.

This set includes 8 pistons, each with a 4.155-inch bore and a flat-top design. They are designed for optimal performance and durability, making them a solid choice for anyone rebuilding or upgrading their LS engine for serious use. Keep in mind that these pistons are not CARB approved and cannot be shipped to California.