Supertech Nissan RB26 31.15x6.94x101.20mm +1mm Sodium Filled Inconel Exhaust Valve - Set of 12

This set includes 12 Supertech Inconel exhaust valves, each measuring 31.15mm in diameter with a 6.94mm stem and a total length of 101.20mm. These valves are designed as a +1mm oversize replacement for your Nissan RB26 engine. The Inconel material is chosen for its exceptional heat resistance, making these valves a strong choice for high-performance or demanding engine builds where exhaust temperatures can become extreme.

The key feature here is the sodium-filled stem. This advanced design uses sodium, a metal that melts and vaporizes at operating temperatures, to transfer heat away from the valve face and into the valve guide more efficiently. This internal cooling helps keep the valve temperature down, reducing the risk of warping or burning, especially under sustained high loads or in turbocharged applications. The +1mm oversize dimension allows for a larger valve head diameter, which can improve airflow into the cylinder, potentially leading to better performance. These are well-built components intended for serious engine work.

When rebuilding or modifying your RB26, especially if you're pushing the limits of the engine, these valves are a critical component to consider. They are designed to handle the heat and stress that can come with increased power output. Ensure you have the correct valve guides and seals to match the +1mm oversize and the specific stem diameter for a proper installation. Refer to the manufacturer's installation instructions for detailed guidance.