JE Pistons Subaru EJ20 Stroker Ultra Series 8.5:1 (Set of 4 Pistons)

JE Pistons' Ultra Series pistons start with a unique Aligned Grain Flow forging process, a proprietary method that maximizes tensile strength. This is crucial for Subaru EJ20 engines that are being built for serious power, especially with forced induction. These aren't your average replacement pistons; they're designed from the ground up to handle the extreme cylinder pressures that come with high-boost applications.

Each piston in this set features a thermal barrier crown coating, which is a ceramic-based material that reflects heat back into the combustion chamber. This helps keep the piston crown cooler, improving overall engine efficiency and exhaust scavenging. You'll also find a durable skirt coating that works to reduce friction and wear against the cylinder walls, leading to quieter operation, especially during cold starts, and longer engine life. Lateral gas ports are included to help maintain a solid seal on the top compression ring, even when you're pushing high RPMs and significant boost levels.

This set includes four pistons, each with a 3.642-inch bore and an 8.5:1 compression ratio, featuring an inverted dome/dish design. They also come with high-strength, thick-wall wrist pins from Trend Performance, built to withstand the rigors of performance builds. Every component in this kit is made 100% in the USA, ensuring a well-built product ready for your next engine project.