Supertech Nissan VR30DDTT 28.5x.546x97.5mm Inconel Sodium Filled Exhaust Valve - Set of 12

These Supertech exhaust valves are made from Inconel, a high-nickel, high-chromium alloy known for its exceptional strength and resistance to extreme heat and corrosion. Each valve measures 28.5mm in diameter, has a 0.546-inch stem, and a total length of 97.5mm. They are also sodium-filled, a feature that helps to dissipate heat away from the valve face and stem, keeping them cooler under demanding operating conditions. This is particularly important for high-performance or heavily modified engines where exhaust gas temperatures can become very high.

The choice of Inconel for exhaust valves is a deliberate one for engines that push the limits. Its ability to maintain structural integrity at temperatures exceeding 1000°F (538°C) makes it a reliable material for the harsh environment of the exhaust port. The sodium filling inside the valve stem acts like a heat exchanger; as the valve heats up, the sodium melts and circulates, transferring heat from the valve head to the cooler part of the stem where it can be dissipated into the valve guide. This advanced cooling mechanism helps prevent valve distortion, sticking, and premature wear, ensuring consistent performance and longevity.

This set includes 12 valves, making it suitable for a complete engine rebuild or upgrade on a Nissan VR30DDTT engine. When rebuilding the top end of an engine like this, using components designed for extreme conditions ensures that your engine can handle the stress. It's always a good idea to consult your engine's service manual for specific installation procedures and recommended clearances when installing performance valve components.