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

When you're building a high-performance Subaru EJ20 engine, you need parts that can handle serious stress. This set of four JE Pistons Ultra Series stroker pistons is designed to be the foundation of your power-adder build. They feature an 8.5:1 compression ratio, a 3.661-inch bore, and are made from 2618 aluminum, a strong material commonly used in performance applications. These are not your average pistons; they come with custom-level features right out of the box.

JE Pistons uses their proprietary Aligned Grain Flow forging process, which maximizes the material's tensile strength to stand up to extreme cylinder pressures. You'll also find a thermal barrier crown coating that reflects heat, helping to keep piston crown temperatures down and improve how efficiently exhaust gases are scavenged. For reduced friction and wear on the skirts and cylinder walls, a special skirt coating is applied, which also helps quiet things down, especially during a cold start. The pistons are equipped with lateral gas ports to help maintain a solid ring seal even under high RPM and high boost conditions. Plus, they include high-strength wrist pins from Trend Performance and optimized pin oiling features to ensure everything stays well-lubricated.

Every aspect of these Ultra Series pistons is optimized for high-horsepower racing engines. They are made 100% in the USA, ensuring a high level of manufacturing quality. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. If you're pushing your EJ20 hard, these pistons are built to take it.