Supertech Mitsubishi 4G63/4G63T Inconel Exhaust Valve - +1mm Oversize - Set of 8

Crafted from Inconel, a high-nickel, high-chromium alloy, these Supertech exhaust valves are built to handle the extreme temperatures found in performance Mitsubishi 4G63 and 4G63T engines. This set includes eight valves, each measuring 1mm oversize compared to stock, designed to improve sealing and airflow when used with appropriately sized valve seats. The Inconel material is chosen for its exceptional resistance to heat and corrosion, making it a solid choice for builds that push the limits of the engine.

When you're rebuilding the top end of a 4G63 or 4G63T, especially for boosted applications, the exhaust valves are a critical component. These valves are well-built to withstand the higher cylinder pressures and temperatures that come with increased boost. The +1mm oversize design means you'll need to ensure your cylinder head is machined to accept them, typically by re-cutting the valve seats to match the larger diameter. This process helps ensure a proper seal and can contribute to improved engine performance and longevity under demanding conditions.