Supertech Mazda Miata 1.6L Black Nitrided Exhaust Valve - +1mm Oversize - Single

The black nitriding treatment on this Supertech exhaust valve for your Mazda Miata 1.6L is a key detail. It hardens the valve face and stem, which helps it resist wear and reduces friction as it moves in the valve guide. This particular valve is also +1mm oversize, meaning it's a bit larger than the stock valve. This is often used when rebuilding an engine, especially if the valve seats have been re-ground or if you're looking for a bit more sealing surface.

When you're rebuilding the top end of your Miata's engine, using well-made valves like these from Supertech makes a difference. The nitriding process not only improves durability but also helps the valve seal better over time. Because it's a single valve, you can order exactly how many you need to replace worn or damaged ones in your engine.