Wiseco Mitsu Evo 4-9 4G63 Asymmetric Skirt Bore 87.00mm - Size +.080 - CR 9.5 Piston Set

This set includes four forged pistons from Wiseco, specifically made for the Mitsubishi 4G63 engine found in Evo models 4 through 9. These pistons are designed for a 87.00mm bore and have a compression ratio of 9.5:1, with an additional 0.080 inch oversize. They are built from 2618 aluminum, a material chosen for its improved tensile strength, and are forged and machined right here in the USA.

Wiseco has packed these pistons with features for serious racing applications. You'll find precision ring grooves, an anti-detonation groove, and other features aimed at improving ring seal. The crown of each piston is fully machined, and they come with forced pin oiling to ensure the wrist pins stay well-lubricated under high stress. A notable feature is the ArmorGlide skirt coating, which helps resist seizure, reduces friction, and contributes to quieter operation. These are intended for heavy to severe duty performance builds where durability and consistent performance are critical.

It's important to note that these pistons are not CARB approved and cannot be shipped to California. If you're rebuilding the top end of your 4G63 for a demanding race application, this set from Wiseco is a solid option designed to handle significant stress.