Wiseco Mitsu Evo 4-9 4G63 Asymmetric Skirt Bore 86.75mm - Size +.070 - CR 9.5 Piston Set

This set includes four Wiseco Professional Series forged pistons, designed specifically for Mitsubishi 4G63 engines found in Evo 4-9 models. These pistons are built for demanding performance applications, featuring an asymmetric skirt design and a bore size of 86.75mm, which is 0.070 inches larger than stock. The 9.5:1 compression ratio is suitable for many performance builds where a balance between power and drivability is desired.

Crafted from 2618 aluminum in the USA, these pistons are forged and machined for improved tensile strength and durability under heavy stress. They come with precision ring grooves, anti-detonation grooves, and features aimed at improving ring seal for better combustion efficiency. The pistons also include an ArmorGlide skirt coating, which helps reduce friction, resist seizure, and operate more quietly. Forged pin oiling is also incorporated to ensure proper lubrication of the wrist pin.

These pistons are intended for serious racers and builders who need robust components for severe duty applications. Please note that this part is not CARB approved and cannot be shipped to California. It's recommended to consult manufacturer installation instructions for proper fitment and assembly procedures.