JE Pistons Ultra Series Mitsubishi EVO 7-9 4G63 85.5mm Bore 10.0:1 CR Set of 4 Pistons

Starting with JE Pistons' proprietary Aligned Grain Flow technology, these Ultra Series pistons are built to handle the extreme cylinder pressures found in high-boost, performance engine builds. This exclusive forging process maximizes tensile strength, giving you a solid foundation for your Mitsubishi EVO 7-9's 4G63 engine. The pistons measure 85.5mm in bore diameter and are designed for a 10.0:1 compression ratio, making them a strong choice for serious engine work.

Beyond the core forging, JE has equipped these pistons with custom-level features typically found only in bespoke builds. The thermal barrier crown coating reflects heat back into the combustion chamber, helping to manage temperatures and improve exhaust scavenging. A skirt coating is applied to reduce friction and wear against the cylinder walls, which also contributes to quieter operation, especially during cold starts. Lateral gas ports are integrated to help maintain a strong seal on the top compression ring, even at high RPMs and under significant boost, ensuring consistent power delivery.

These pistons also feature enhanced pin oiling to keep the wrist pins, bores, and connecting rod small ends well-lubricated, further reducing heat and wear. The included Trend Performance wrist pins are thick-walled and built for the demands of high-horsepower applications. Every component in this set is made 100% in the USA, ensuring a well-built product ready for your performance engine project. Please note that these pistons are not CARB approved and cannot be shipped to California.