Supertech Mitsubishi 4G63 85.5mm (+0.5) -20.5cc Dish 8.6:1/9:1 CR Piston - Set of 4 (Excl Rings)

If you're rebuilding the engine in your Mitsubishi 4G63, a solid set of pistons is crucial for performance and reliability. These Supertech pistons are designed to replace your stock units, offering a well-built foundation for your build. They feature a -20.5cc dish, which helps achieve a compression ratio of either 8.6:1 or 9:1, depending on your cylinder head volume. This makes them a popular choice for those looking to tune their 4G63 for more power while maintaining streetability.

Forged from high-strength aluminum alloy, these pistons are built to withstand the increased pressures and temperatures common in modified 4G63 engines. The 85.5mm bore size is a +0.5mm overbore, meaning these are intended for engines that have already been bored out to this size. It's important to note that this set includes the pistons only; you'll need to source your own piston rings separately. This allows you the flexibility to choose the exact ring set that best suits your build's specific needs and your preferred lubrication strategy.

When installing these pistons, remember to consult your engine's service manual for proper torque specifications and assembly procedures. Because these are a +0.5mm overbore, ensuring your cylinder walls are properly honed to match the piston skirt clearance is essential for optimal performance and longevity. Please be aware that these pistons are not CARB approved and cannot be shipped to California.