Supertech Honda K20/K24/F20C1/F22C1 Black Nitrided Exhaust Valve - +0.5mm Oversize - Set of 8

If you're rebuilding the top end of your Honda K20, K24, F20C1, or F22C1 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 experience higher temperatures than their intake counterparts.

Supertech is known for making well-built internal engine components, and these valves are no exception. The black nitriding not only improves durability but also helps reduce friction, allowing the valve to seat and unseat more smoothly. Using oversize valves like these is a common practice when machining cylinder heads to ensure a proper seal and maximize the lifespan of the rebuild. Make sure to check your cylinder head's specifications to confirm that it can be machined to accept the +0.5mm oversize dimension.