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

If you're building a high-performance Mitsubishi Evo 4-9 with the 4G63T engine, this Wiseco piston set is designed for serious power. These are forged pistons, meaning they start as a block of 2618 aluminum that's heated and hammered into shape. This process makes them much stronger and more durable than cast pistons, which is essential when you're pushing the limits of a stroker engine.

Wiseco machines these pistons right here in the USA, ensuring precision. You'll find updated features like anti-detonation grooves and special ring grooves that help seal the combustion chamber better, preventing blow-by and improving power. They also come with an ArmorGlide skirt coating. This isn't just for looks; it helps reduce friction, makes the engine run quieter, and resists seizure if things get really hot. The pin oiling is also forced, meaning it gets oil exactly where it needs it for longevity under heavy load.

This set is specifically for a 4G63T engine with a bore of 86.50mm, which is a +.060 overbore from the standard size. The compression ratio comes in at 9.5:1, a solid choice for many forced induction setups. Keep in mind these are built for heavy to severe duty race applications, so they're ready for demanding builds. They are not CARB approved and cannot be shipped to California.