Wiseco Mitsu Evo 4-9 4G63 Asymmetric Skirt Bore 86.00mm - Size +.040 - CR 9.5 Piston Set

This set includes four Wiseco forged pistons, specifically made for Mitsubishi 4G63 engines found in Evo 4-9 models. These pistons are 86.00mm in bore size and are +.040 inches oversized, featuring a 9.5:1 compression ratio. They are designed and built in the USA from 2618 aluminum, chosen for its improved tensile strength, making them well-suited for heavy to severe duty race applications.

Wiseco has packed these pistons with features for serious builders. You'll find precision ring grooves, anti-detonation grooves, and other features to improve ring seal. The ArmorGlide skirt coating helps reduce friction and resist seizure, while also contributing to quieter operation. The fully machined crown and forced pin oiling further enhance their durability and performance under demanding conditions.

Because these are a performance-oriented part, it's important to note they are not CARB approved and cannot be shipped to California. If you're rebuilding the top end of your 4G63 for serious racing, these Wiseco pistons offer a robust foundation.