JE Pistons SUB STI EJ257 Block w/ EJ20 Head 99.75mm Bore CR 8.5 KIT Set of 4 Pistons

JE Pistons has been a leader in forged racing pistons for over 75 years, and they apply that experience to their wide range of pistons for import and sport compact vehicles. This specific kit is engineered for Subaru EJ257 blocks with EJ20 heads, featuring a 99.75mm bore and a 8.5:1 compression ratio. These pistons are forged and machined 100% in the USA using 2618 aluminum, which provides the high tensile strength needed for demanding performance applications. They are designed specifically for this engine and use to give you the best combination of durability and performance.

This kit includes JE Pistons' proprietary Forged Side Relief (FSR) forging design. This design helps minimize friction and power loss by using a reduced skirt width and a shorter wrist pin, which also saves weight. Depending on the specific application, these pistons may also feature an accumulator groove to help reduce pressure from combustion gases, which can reduce ring flutter and improve ring seal for more consistent power. Some applications also include a skirt coating to reduce friction and wear on the piston skirts and cylinder walls, which can also help reduce operating noise. You'll get everything you need to get started, including high-quality wrist pins, locks, and JE Pro Seal premium piston rings.

This piston set is designed for high-demand performance applications, but please note that it is not CARB approved and cannot be shipped to California. If you're building a high-performance Subaru engine, this set offers a solid foundation with proven materials and design.