Wiseco Mitsu Evo 4-9 HD2 Asymmetric Skirt Gas Ported Bore 86.75mm - Size +.070 -CR 10.5:1 Piston Set

Forged from 2618 aluminum, these Wiseco HD2 pistons are built for the demanding Mitsubishi Evo 4-9 engine builds. The 86.75mm bore size, which is a +.070 inch overbore from stock, combined with a 10.5:1 compression ratio, is designed for serious performance applications where increased power and durability are critical. These are not your average pistons; they are packed with features aimed at handling heavy to severe duty racing conditions.

Wiseco has incorporated several advanced features into this piston set. The asymmetric skirt design, along with the ArmorGlide skirt coating, helps reduce friction and resist seizure, which is crucial under high heat and stress. Gas porting and precision ring grooves, including anti-detonation grooves, work together to improve ring seal and prevent detonation, keeping your engine running strong. The forced pin oiling system ensures the wrist pin receives adequate lubrication, further enhancing longevity. The fully machined crown ensures precise combustion chamber volume for consistent performance.

This set includes four pistons, ready for your engine rebuild. Remember that these pistons are not CARB approved and cannot be shipped to California. For builders tackling a high-performance 4G63T engine, these Wiseco pistons offer a well-built foundation for significant power gains and sustained reliability under extreme conditions.