Supertech Mitsubishi 4G63 Black Nitrided Exhaust Valve - +1mm Oversize - Set of 8

If you're rebuilding the top end of your Mitsubishi 4G63 engine, these Supertech Black Nitrided Exhaust Valves are a solid option. This set includes eight valves, each measuring 1 millimeter oversize compared to stock. The black nitriding process hardens the valve surface, which helps improve wear resistance and can also contribute to better sealing.

These valves are specifically made for the 4G63 engine, a popular choice for performance builds. The +1mm oversize means they are larger in diameter than the original valves, which can help increase airflow into the combustion chamber when paired with appropriate porting and valve seats. The nitriding treatment not only adds durability but also gives the valves a distinct black finish.

When installing these, ensure your valve guides and seats are properly machined to accept the oversize diameter. Proper installation is key to getting the most out of these components and ensuring the longevity of your engine rebuild.