Kibblewhite Black Diamond™ exhaust engine valve CNC-machined from a one-piece EV8 stainless steel forging for strength and consistent performance. Special surface treatment and a black Nitroneg-coated stem reduce friction and improve wear and corrosion resistance.
Kibblewhite Black Diamond™ Engine Valve is a premium replacement exhaust valve designed for riders and builders who want long service life and reliable valvetrain performance. CNC-machined from a lightweight, strong one-piece EV8 stainless steel forging, it delivers consistent dimensions and excellent flow characteristics for efficient combustion and responsive power delivery. A special German infusion process improves wear properties, reduces friction, and adds corrosion resistance—helping your top end stay smoother for longer under heat and load.
If you’re rebuilding a cylinder head, refreshing a worn valvetrain, or aiming for dependable performance under demanding riding conditions, this valve is built to handle it. The black Nitroneg-coated stem helps reduce friction at the guide, supporting smoother operation and durability over time.
