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

This is a set of four JE Pistons Ultra Series forged pistons, designed specifically for Subaru EJ20 engines with a 3.622-inch bore and an 8.5:1 compression ratio. These pistons are built for serious performance, featuring JE's proprietary Aligned Grain Flow forging technology, which maximizes tensile strength to handle the extreme cylinder pressures found in high-boost engine builds. They come equipped with custom-level features that you'd typically only find in a full custom build.

Each piston in this set includes a thermal barrier crown coating, which reflects heat back into the combustion chamber, helping to lower piston crown temperatures and improve exhaust gas scavenging. The skirts are coated to reduce friction and wear on both the piston and cylinder walls, also contributing to quieter operation, especially during cold starts. To ensure proper lubrication under demanding conditions, these pistons feature optimized pin oiling and lateral gas ports. The gas ports help maintain a solid ring seal on the top compression ring, even at high RPMs and under significant boost, which is crucial for consistent power production.

These Ultra Series pistons are made 100% in the USA and include high-strength, thick-wall wrist pins manufactured by Trend Performance, also in the USA, to withstand the rigors of power-adder applications. If you're building a high-horsepower Subaru EJ20 engine, these pistons are a well-built choice designed to perform under extreme stress.