JE Pistons SUB STI EJ257 Block w/ EJ20 Head 99.5mm Bore CR 8.5 (Right Side) Single Piston

If you're rebuilding the top end of your Subaru EJ257 block with an EJ20 head, you need a piston that can handle the demands of performance. This single forged piston from JE Pistons is built for that job. It features a 99.5mm bore and a compression ratio of 8.5:1, designed to work specifically with that engine combination.

JE Pistons uses 2618 aluminum for these pistons, which gives them the high tensile strength needed for high-demand performance applications. They're forged and machined 100% in the USA, ensuring solid construction. This piston also includes JE's proprietary Forged Side Relief (FSR) design, which helps minimize friction and power loss by reducing skirt width. Some applications also get a skirt coating to further cut down on friction and wear, while also reducing operating noise.

This piston comes as a single unit and includes high-quality wrist pins, locks, and JE Pro Seal premium piston rings. Keep in mind this part is not CARB approved and cannot be shipped to California.