Manley Mitsubishi Evo 4G63/4G63T 85.5mm Bore 10/10.5:1 CR -2.5cc Flat Top E/D Piston Set w/Rings

If you're rebuilding the engine in your Mitsubishi Evo with the 4G63 or 4G63T engine, you're likely looking for pistons that can handle more power and last. These Manley Performance pistons are built for that purpose. They feature a flat top design with a -2.5cc dish, aiming for a 10:1 to 10.5:1 compression ratio depending on your cylinder head volume. This makes them a solid choice for builds looking to improve performance without going too extreme on compression.

Manley uses their signature 2618 alloy forgings, which are known for being strong and reliable under high stress. The pistons also come with premium chrome moly wrist pins, and Manley pays close attention to the ring lands and grooves. They machine these to strict standards to ensure a good seal with your piston rings, which is crucial for making good power and keeping compression where it belongs. The skirt profiles are designed to be efficient and not overly harsh on your cylinder walls during operation.

These pistons are made with a unique fixturing process that allows them to machine the skirt and ring grooves in the same setup. This helps ensure that the ring grooves are perfectly square to the piston skirt, contributing to better ring seal and overall engine health. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. They are designed for performance builds and are a popular choice among professional engine builders.