Kibblewhite Black Diamond™ valves are built for riders and engine builders who want reliable valvetrain performance under heat and load. This exhaust engine valve is CNC-machined from a one-piece EV8 stainless steel forging, delivering a strong yet lightweight design with profiles engineered for excellent airflow characteristics.
To improve durability, the valve is treated with a special German infusion process that increases surface hardness and helps reduce friction, resist corrosion and improve wear properties beyond traditional chrome or nickel electrolysis plating. The result is a valve designed to keep sealing and performance consistent for longer—ideal for rebuilds where longevity matters.
Key features:
✅ One-piece EV8 stainless forging – CNC-machined for strength and precision
✅ Advanced wear treatment – infused surface to improve wear, reduce friction and resist corrosion
✅ Engineered flow profile – designed with F.E.A. and tested on a computerized flow bench
Benefits of use:
🔹 Longer service life compared with basic replacement valves thanks to enhanced wear properties
🔹 Consistent performance through accurate machining and optimized flow characteristics
🔹 Built for demanding conditions with corrosion resistance and a black Nitroneg-coated stem
Technical specifications:
📌 Application: Exhaust
📌 Head diameter: 24.50 mm (0.965")
📌 Stem diameter: 4.50 mm (0.1758")
📌 Length: 3.070"
📌 Tulip angle: 25°
📌 Material: Stainless Steel (EV8)
📌 Units: Each
📌 Vendor part number: 80-80077
Why choose this product?
⭐ Made in the USA and engineered with modern analysis/testing for dependable fit and function
⭐ Premium Black Diamond™ construction for riders who prioritize durability and performance in a rebuild
⭐ Important note: Requires the use of a Kibblewhite spring kit
