Supertech Nissan SR20DE Black Nitrided Exhaust Valve - +0.5mm Oversize - Set of 8

If you're rebuilding the top end of your Nissan SR20DE engine, these Supertech Black Nitrided Exhaust Valves are a solid option. This set includes eight valves, each measuring 0.5mm oversize to help restore compression and performance in engines with worn valve seats or guides. The black nitriding process hardens the valve surface, making it more resistant to wear and heat, which is crucial for exhaust valves that see high temperatures.

These valves are designed as a direct replacement for your stock SR20DE exhaust valves, but with the added benefit of the surface treatment for improved durability. The +0.5mm oversize means they are slightly larger in diameter than the original valves, which is a common practice when resurfacing cylinder heads or when dealing with minor damage to the valve seat area. This ensures a proper seal and helps bring your engine back to its intended performance levels.

When installing these valves, it's important to ensure your valve guides are properly sized for the oversize stems and that the valve seats are in good condition to accept the new valve faces. Always refer to your SR20DE service manual for the correct installation procedures and specifications.