JE Pistons SUB STI EJ257 Block w/ EJ20 Head 99.75mm Bore Single Piston - Right

If you're rebuilding the engine in your Subaru EJ257 with an EJ20 block, a strong, well-made piston is crucial. This single forged piston from JE Pistons is built to handle the demands of performance applications. It's designed to work with a 99.75mm bore, offering a solid foundation for your engine build.

Crafted from 2618 aluminum right here in the USA, this piston has the high tensile strength needed for high-demand performance. JE Pistons uses a proprietary Forged Side Relief (FSR) design, which helps minimize friction and power loss by reducing skirt width. Depending on the specific application, it may also feature a skirt coating to further reduce friction and wear, while also quieting down operation. An accumulator groove can also be included to help manage combustion gas pressure, improving ring seal for consistent power delivery.

This piston comes complete with high-quality wrist pins, locks, and JE Pro Seal premium piston rings, so you have the essential components ready for installation. Please note that this piston is not CARB approved and cannot be shipped to California.