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

When you're building a serious performance engine for your Mitsubishi Evo 4-9, especially one designed for stroking and heavy-duty racing, the pistons are a critical component. This set from Wiseco is built from the ground up for those demanding applications. They feature an 86.75mm bore, which is a +.070 inch overbore from stock, and are designed to achieve a 9.5:1 compression ratio, making them suitable for a wide range of performance tuning.

These pistons are forged in the USA from 2618 aluminum, a material chosen for its improved tensile strength, which is essential for handling the extreme pressures of a stroker engine. Wiseco has included several advanced features like precision ring grooves, anti-detonation grooves, and additional ring seal improvements to ensure a solid seal and prevent detonation. The crown is fully machined for accuracy, and they come with forced pin oiling to keep the wrist pins properly lubricated under high stress. A notable feature is the ArmorGlide skirt coating, which helps reduce friction, resist seizure, and operate more quietly.

This set is intended for heavy to severe duty race builds. Please note that these pistons are not CARB approved and cannot be shipped to California. For a complete build, ensure you have all necessary supporting components and refer to manufacturer instructions for proper installation.