Supertech Honda H22A1/H22A4 Black Nitrided Exhaust Valve - +0.5mm Oversize - Set of 8

If you're rebuilding the top end of your Honda H22A1 or H22A4 engine, new exhaust valves are a critical part of the job. These Supertech valves are designed to handle the heat and stress of performance applications, ensuring your engine breathes freely and reliably.

Each valve in this set of eight has been treated with a black nitriding process. This surface hardening technique creates a tough, wear-resistant layer that helps the valve stand up to repeated cycles and high temperatures, especially important in performance-tuned engines. They are also 0.5mm oversize, which is useful when reconditioning cylinder heads that may have worn valve seats or if you're looking for a slightly larger valve for improved flow. This size is a common choice for mild performance builds and engine refreshes.

When installing these valves, remember they are designed to be a direct replacement for the stock units, but with the added benefit of the nitrided surface and the oversize dimension. Ensure your valve guides and seats are properly prepared to accept the +0.5mm size for optimal sealing and performance.