Wiseco Mitsu Evo 4-9 4G63 Asymmetric Skirt Bore 86.50mm - Size +.060 - CR 9.5 Piston Set

If you're rebuilding the engine in your Mitsubishi Evo 4-9, this set of Wiseco forged pistons is built for serious performance. These pistons are specifically made for the 4G63 engine, with a bore size of 86.50mm and a compression ratio of 9.5:1. They are designed to handle the demands of heavy to severe duty race applications, meaning they're well-built to withstand high stress and heat.

Wiseco crafts these pistons from 2618 aluminum in the USA, which gives them improved tensile strength. You'll find precision ring grooves, anti-detonation grooves, and other features that help improve ring seal. They also come with an ArmorGlide skirt coating that helps reduce friction, resist seizure, and operate more quietly. The fully machined crown and forced pin oiling are also notable features that contribute to their durability and performance in demanding builds.

This set includes four pistons, each with a 34.87mm compression height and a 0.866-inch pin diameter. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. For a robust engine build that can handle intense use, this Wiseco piston set is a solid option.