What material are these JE 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.

Are these pistons a direct replacement for my stock LS pistons?

These are performance forged pistons designed for modified or performance LS engines. They are intended for specific bore sizes and may require other modifications for installation. Always consult your engine builder or refer to JE Pistons' technical specifications for compatibility with your build.

What does the 'ASYM FT' in the product name mean?

ASYM typically refers to an asymmetrical skirt design, and FT stands for Flat Top. This indicates the piston top profile and a specific skirt design intended to optimize performance and reduce friction in certain engine configurations.

JE Pistons Forged Piston Set 311991 - 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-t14-296222
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 from 2618 aluminum for high-demand performance.

Key Features

Fits LS engines with a 4.005 inch bore.
Set includes 8 forged pistons.
Constructed from 2618 aluminum for high tensile strength and durability.
Features a proprietary Forged Side Relief (FSR) design for reduced friction and weight.
May include an accumulator groove to reduce combustion gas pressure and improve ring seal.
Skirt coating (application dependent) reduces friction and wear while lowering operating noise.

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Product Details

If you're building a high-performance LS engine, JE Pistons has a well-built option for you with this set of 8 forged pistons. These aren't your average pistons; they're crafted using a proprietary Forged Side Relief (FSR) design, which means they have a reduced skirt width. This not only helps minimize friction and power loss but also saves weight, especially when paired with a shorter wrist pin. The pistons are made from 2618 aluminum, a material known for its high tensile strength, making it ideal for engines that demand a lot of performance and durability.

JE Pistons has been in the game for over 75 years, and they engineer and machine these pistons right here in the USA. They're designed specifically for each engine and application, ensuring you get optimized performance and longevity. Depending on your specific LS engine application, these pistons might also feature an accumulator groove to help control combustion gas pressure, reducing ring flutter and improving the seal for consistent power. Some applications also include a skirt coating to further reduce friction and wear on the piston skirts and cylinder walls, which can also help quiet down engine noise.

This set is designed for a 4.005-inch bore and includes everything you need for an 8-cylinder engine. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. If you're looking to equip your LS engine with a solid set of forged pistons that have a proven track record in racing, these are a strong option.