Wiseco Mitsu Evo 4-9 HD2 Asymmetric Skirt Gas Ported Bore 86.00mm - Size +.40 - CR 10.5 Piston Set

If you're building a serious performance Mitsubishi Evo 4-9, you need pistons that can handle the stress. This set from Wiseco is built for those demanding applications. These are their Professional Series forged pistons, designed from the ground up for heavy-duty racing and severe duty builds. They start with 2618 aluminum, which is forged and machined right here in the USA for improved tensile strength, giving you a solid foundation for your engine.

Wiseco packed these pistons with features to ensure durability and performance. You'll find precision ring grooves, an anti-detonation groove, and other seal-improving features to keep everything running tight. The asymmetric skirt design with ArmorGlide coating helps reduce friction and noise, while also resisting seizure. The crown is fully machined, and they even include forced pin oiling to keep the wrist pins lubricated under extreme conditions. This set is for an 86.00mm bore, with a 10.5:1 compression ratio, and they are +.040 inches oversized.

It's important to note that these pistons are not CARB approved and cannot be shipped to California. They are designed for serious builders who need robust components for high-performance engines.