Supertech Nissan SR20DE Black Nitrided Exhaust Valve - +0.5mm Oversize - Single

The black nitriding treatment on this Supertech exhaust valve is a key detail. It hardens the valve face and stem, which helps it resist wear and stand up better to the heat and stress of the exhaust cycle. This particular valve is a +0.5mm oversize option, meaning it's designed to replace a stock valve that's been worn or damaged, or to be used in an engine rebuild where the valve seat has been re-ground to accommodate a larger valve for improved flow.

When you're rebuilding the top end of your Nissan SR20DE, especially if you're looking to restore performance or make improvements, using valves that are built to last is important. Supertech uses solid materials and processes like this nitriding to ensure their valves can handle the demands of the engine. This single exhaust valve is a direct replacement for the stock part, but the oversize dimension means it's intended for specific engine work where the cylinder head has been prepared for it.