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 crucial for high-demand performance applications.

What is the Forged Side Relief (FSR) design?

The FSR design is a proprietary feature from JE Pistons that minimizes friction and power loss. It achieves this through a reduced skirt width and a shorter wrist pin, which also helps save weight.

Are these pistons compatible with all LS engines?

These pistons are specifically designed for LS engines with a 4.000 inch bore. It's important to verify the specific bore size and other engine requirements for your build to ensure proper fitment.

JE Pistons Forged Piston Set 311990 - LS Engine

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-t14-296221
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 performance applications.

Key Features

Fits LS engines with a 4.000 inch bore.
Set includes 8 forged pistons.
Constructed from 2618 aluminum for high tensile strength.
Features a proprietary Forged Side Relief (FSR) design to minimize friction and power loss.
Includes a flat-top piston design with a -5.00 cc dish.
Pistons are forged, engineered, and machined 100% in the USA.

This piston set is designed for LS engines. Check manufacturer specifications to confirm compatibility with your specific engine build.

Secure CheckoutFast Shipping631-982-0042

Product Details

Starting with a 2618 aluminum forging, these JE Pistons are built for serious performance in LS engines. They're designed with a flat-top configuration and a 4.000-inch bore, ready to handle the demands of high-horsepower builds. JE Pistons has been making forged racing pistons for over 75 years, and they engineer and machine these right here in the USA to ensure top durability and performance.

What sets these apart is the proprietary Forged Side Relief (FSR) design. This means they've got a reduced skirt width to cut down on friction and power loss, plus a shorter wrist pin to save even more weight. Depending on the specific application, you might also find an accumulator groove, which helps keep combustion gas pressure in check to prevent ring flutter and maintain a consistent seal. Some applications also include a skirt coating that further reduces friction and wear, making the engine run quieter and last longer.

Because these are made specifically for the LS engine and its intended use, you get optimized performance and durability. The 2618 aluminum provides the high tensile strength needed for demanding applications, whether you're on the dirt track or the drag strip. This set includes all eight pistons, ready for your engine build.