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

Supertech is well-known for making performance engine components, and these sodium-filled Inconel exhaust valves are a prime example of their work for the Mitsubishi 4G63 and 4G63T engines. If you're rebuilding the top end of your engine, especially for boosted applications, these valves are designed to handle the extreme heat and stress that comes with high-performance tuning.

These are exhaust valves, which means they're going to be exposed to the hottest gases exiting the combustion chamber. To combat this, they're made from Inconel, a superalloy that's incredibly resistant to high temperatures and corrosion. The sodium filling inside the valve stem is a clever trick; as the engine runs, the sodium melts and circulates, absorbing heat from the valve face and transferring it to the valve guide. This helps keep the valve temperature down, which is crucial for preventing valve seat recession and maintaining consistent sealing under demanding conditions. This set includes eight valves, each one a +1mm oversize, meaning they are slightly larger than stock to allow for a more thorough valve job and potentially improved flow when paired with matching port work.

When you're putting together a high-performance engine, especially one that will see significant boost, using components that can withstand the extra heat and pressure is key. These Supertech valves are built for that purpose, offering a solid option for enthusiasts looking to maximize the reliability and performance of their 4G63 or 4G63T build. Make sure to check your cylinder head for proper valve seat compatibility with the +1mm oversize dimension.