Wiseco Mitsu Evo 4-9 4G63 Stroker Asymmetric Skirt Bore 85.50mm - Size +.020 - CR 9.5 Piston Set

If you're building a high-performance Mitsubishi 4G63 engine for serious racing or severe duty applications, a strong set of forged pistons is essential. This Wiseco piston set is specifically designed for the Evo 4-9 models, featuring a 85.50mm bore and a +.020 undersize, with a 9.5:1 compression ratio. These aren't just standard replacement parts; they're built from the ground up for demanding performance builds where reliability under extreme stress is critical.

Wiseco crafts these pistons from 2618 aluminum, a material known for its improved tensile strength, making them well-suited for the high pressures and temperatures found in racing engines. They come with precision ring grooves, an anti-detonation groove, and features designed to improve ring seal, all contributing to better combustion efficiency and durability. The fully machined crown ensures accurate dimensions, and forced pin oiling helps keep the wrist pins properly lubricated. Additionally, the ArmorGlide skirt coating helps reduce friction and noise, while also resisting seizure, which is a notable benefit in high-stress engine operation.

This set includes four pistons, ready for installation in your stroker 4G63 build. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. For optimal results and longevity, always refer to the manufacturer's installation instructions and recommended assembly procedures.