Wiseco Mitsu Evo 4-9 4G63 Asymmetric Skirt Bore 85.00mm - Size STD - CR 9.5 Piston Set

When you're building a high-performance Mitsubishi Evo 4-9 for serious racing, the pistons are a critical component. This set from Wiseco is designed for those demanding builds where reliability and strength are paramount. These aren't your average pistons; they're forged from 2618 aluminum right here in the USA, giving them improved tensile strength to handle the stress of heavy and severe duty applications.

Wiseco has packed a lot of smart design into these pistons. You'll find precision ring grooves, an anti-detonation groove, and other features aimed at improving ring seal, which is key for both power and longevity. They also come with an ArmorGlide skirt coating. This coating helps resist seizure, reduces friction, and makes for quieter operation, all important factors when you're pushing an engine hard. The fully machined crown ensures accuracy, and forced pin oiling helps keep the wrist pins lubricated under extreme conditions.

This set includes four pistons, each with an 85.00mm bore and a 9.5:1 compression ratio. Remember, these pistons are not CARB approved and cannot be shipped to California. If you're serious about your Evo's engine build, this Wiseco piston set is a well-built option designed for the task.