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

The FSR forging design helps minimize friction and power loss. It achieves this by reducing the piston skirt width and using a shorter wrist pin, which also saves additional weight.

Are these pistons compatible with all LS engines?

This set is designed for LS engines with a 4.065 inch bore. While JE Pistons engineers them for specific applications, it's always best to verify compatibility with your exact engine model and build specifications.

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

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

JE Pistons Forged Piston Set 311959 - LS

Name: JE Pistons LS ASYM FT 6098OEM Set of 8 Pistons
Brand: JE Pistons
SKU: je-pistons-je-pistons-ls-asym-ft-6098oem-set-of-8-pistons-t14-296199
Price: 975.74 USD
Availability: BackOrder

JE Pistons LS ASYM FT 6098OEM 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 6098OEM Set of 8 Pistons. Forged in the USA from 2618 aluminum for high-demand performance.

Key Features

Fits LS engines with a 4.065 inch bore.
Set includes 8 forged pistons.
Features JE Pistons' proprietary Forged Side Relief (FSR) design to minimize friction and power loss.
Pistons are forged in the USA using 2618 aluminum for high tensile strength.
Flat top piston design with a -5.00cc dish.
Includes a 0.945 inch pin diameter.

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Product Details

Forged in the USA from 2618 aluminum, these JE Pistons are built for high-demand performance applications. This set is specifically designed for LS engines, featuring a 4.065-inch bore and a flat-top design with a -5.00cc dish. The proprietary Forged Side Relief (FSR) forging design is key here; it helps minimize friction and power loss by reducing skirt width, while also saving weight with a shorter wrist pin. This attention to detail means you get a well-built piston that's ready for serious work.

JE Pistons brings over 75 years of experience to the table, and it shows in the details. Depending on your specific application, these pistons may include an accumulator groove to reduce combustion gas pressure, which helps prevent ring flutter and improves ring seal for consistent power delivery. They might also feature a skirt coating designed to reduce friction and wear on the piston skirts and cylinder walls, leading to quieter operation and longer life. Every aspect is engineered for optimized performance and durability, making them a solid choice for anyone rebuilding or upgrading their LS engine.

This set includes eight pistons, all manufactured 100% in the USA. Please note that these pistons are not CARB approved and cannot be shipped to California. If you're looking to build a high-performance LS engine, this set offers a proven combination of strength, reduced friction, and optimized design.