Supertech Honda K20 / F20C1/F22C1 Black Nitrided Exhaust Valve - +1mm Oversize - Single (D/S Only)

The black nitriding treatment on this Supertech exhaust valve is a key detail, making the surface harder and more resistant to wear. This is especially important for exhaust valves, which deal with high temperatures and combustion gases. This particular valve is designed as a +1mm oversize option, meaning it's slightly larger than the stock valve. This can help improve sealing and potentially airflow when rebuilding or upgrading your Honda K20, F20C1, or F22C1 engine.

When you're working on the top end of these popular Honda engines, using valves that can handle the heat and stress is crucial for reliability. The nitriding process not only adds durability but also helps reduce friction, which is beneficial for valve train longevity. Because it's a single valve and specifically noted as 'D/S Only', it's important to confirm if you need this specific size and type for your application, often used when replacing a damaged valve or when performing a specific type of rebuild.