Wiseco Mitsu Evo 4-9 4G63 Stroker Asymmetric Skirt Bore 86.00mm - Size +.040 - CR 9.5 Piston Set

Starting with the 2618 aluminum construction, these Wiseco pistons are forged and machined in the USA. This material choice is key for handling the high stresses found in serious racing applications, offering improved tensile strength where it counts. This set is specifically for Mitsubishi Evo 4-9 models with the 4G63 engine, featuring an 86.50 mm bore and a 9.5:1 compression ratio, designed for stroker builds.

Wiseco has packed these pistons with features aimed at durability and performance under heavy loads. You'll find precision ring grooves, anti-detonation grooves, and other features designed to improve ring seal, which is critical for maintaining compression and preventing blow-by in high-performance engines. The crown is fully machined for accuracy, and they include forced pin oiling to ensure the wrist pins stay well-lubricated. The ArmorGlide skirt coating is applied to reduce friction and resist seizure, contributing to quieter operation and longer life even in severe duty conditions.

This set includes four pistons, ready for your performance engine build. Please note that these pistons are not CARB approved and cannot be shipped to California. It's always a good idea to consult your engine builder or the manufacturer's instructions for specific installation details and any other components you might need for your stroker build.