JE Pistons Chevy Small Block 4.040in Bore -5.0cc (Left Side) Single Piston

Forged from 2618 aluminum, this JE Pistons single piston is built for the demands of performance Chevy Small Block engines. It features a 4.040-inch bore and a -5.0cc flat top dish, designed to work with specific cylinder heads for optimized compression. JE Pistons has been a leader in forged racing pistons for over 75 years, and this part reflects that experience, being forged and machined entirely in the USA.

This piston incorporates JE's proprietary Forged Side Relief (FSR) design. This means it has a reduced skirt width and a shorter wrist pin, which helps minimize friction and power loss while also saving weight. Depending on the specific application, some JE pistons also come with a skirt coating to further reduce friction and wear, and an accumulator groove to help improve ring seal. These details matter for consistent power and durability under stress.

This is a single piston, intended for the left side of the engine. Remember that this part is not CARB approved and cannot be shipped to California. Always refer to manufacturer instructions for proper installation and compatibility with your specific engine build.