JE Pistons GM LS 4.030in Bore .030 Oversize -8.6cc Asymmetrical FSR Dish/Inverted Dome - Set of 8

This is a set of eight JE Pistons, specifically designed for GM LS engines with a 4.030-inch bore. These pistons are .030 inches oversize and feature an asymmetrical FSR dish/inverted dome design with a -8.6cc volume. They are forged in the USA from 2618 aluminum, a material chosen for its high tensile strength, which is essential for engines operating under demanding performance conditions. The FSR forging design itself is notable for minimizing friction and power loss by using a reduced skirt width and a shorter wrist pin, which also helps save weight.

JE Pistons has applied over 75 years of experience to create these pistons, ensuring they are engineered for durability and performance. Depending on the specific application, these pistons may include an accumulator groove to help reduce combustion gas pressure, which can prevent ring flutter and improve ring seal for more consistent power delivery. Some applications also feature a skirt coating designed to reduce friction and wear on the piston skirts and cylinder walls, contributing to quieter operation and longer component life. Each piston is machined 100% in the USA, tailored for specific engine designs and racing applications to offer an optimized balance of performance and longevity.

This set is intended for high-demand performance applications, from dirt track racing to drag strip use. It's important to note that these pistons are not CARB approved and cannot be shipped to California. For installation, refer to the manufacturer's instructions for specific details regarding pin fitment and ring installation.