LS ASYM FT 3.900STRK

The JE Pistons 323986R is a set of flat top pistons designed for Chevrolet LS Gen III/IV engines with a 4.125-inch bore. These pistons are forged from 2618 aluminum for high tensile strength and feature a proprietary Forged Side Relief (FSR) design to minimize friction and power loss.

The FSR design utilizes a larger skirt on the major thrust side and a smaller skirt on the minor thrust side, resulting in a high-strength, lightweight piston that significantly reduces engine friction. These pistons are machined for 1.2mm, 1.5mm, and 3.0mm rings and include features like accumulator grooves and double pin oilers. They are made 100% in the USA.