JE Pistons GM LS 4.080in Bore .015 LS3 Oversize 7.1cc Asymmetrical FSR Dome Pistons - Set of 8

When you're rebuilding the top end of your GM LS engine, especially for a performance application like an LS3, a solid set of pistons is crucial. This set from JE Pistons includes eight forged pistons, each measuring 4.080 inches in bore diameter. They are specifically designed as an oversize set, 0.015 inches larger than standard, and feature a 7.1cc asymmetrical FSR dome. These pistons are forged in the USA using 2618 aluminum, a material chosen for its high tensile strength, which is essential for handling the demands of high-performance engines.

JE Pistons brings over 75 years of experience to these components, focusing on a blend of durability and performance. The proprietary Forged Side Relief (FSR) design is a key feature, reducing skirt width to minimize friction and power loss, while also saving weight. Depending on the specific application, these pistons may also include an accumulator groove to help manage combustion gas pressure, reducing ring flutter and improving ring seal for more consistent power delivery. Additionally, a skirt coating, if included for your application, further reduces friction and wear on the piston skirts and cylinder walls, contributing to quieter operation.

This set is engineered specifically for the GM LS engine and its intended use, aiming for optimized performance and longevity. It's important to note that these pistons are not CARB approved and cannot be shipped to California. For installation, you'll want to refer to the manufacturer's detailed instructions, as proper ring gap, piston-to-wall clearance, and wrist pin installation are critical for achieving the desired performance and durability from these high-end components.