Upgrade your valvetrain with a proven, high-wear component designed to last. The Kibblewhite Black Diamond™ Engine Valve is CNC-machined from a one-piece EV8 stainless-steel forging to deliver a lightweight yet strong valve that maintains stable performance under demanding riding conditions. Its carefully developed profile helps improve flow characteristics, supporting consistent power delivery and reliable combustion.
This valve is treated with a special German infusion process to improve wear properties, reduce friction, and increase resistance to corrosion and wear—providing durability that can outperform traditional chrome or nickel electrolysis plating. If you’re rebuilding a head or refreshing a tired top end, this is a smart choice for riders who want long-term reliability and precision-made components.
Key features:
✅ CNC-machined from one-piece EV8 stainless-steel forging (lightweight & strong)
✅ Advanced surface treatment for improved wear resistance, lower friction and corrosion protection
✅ Designed with F.E.A. and tested on a computerized flow bench for optimized profiles
Benefits of use:
🔹 Longer service life in harsh engine conditions thanks to improved wear and corrosion resistance
🔹 More consistent performance with valve profiles developed for excellent flow characteristics
🔹 Premium manufacturing quality (Made in the USA) for dependable fit and function
Technical specifications (as provided):
📌 Application: Intake
📌 Head diameter: 35.99 mm (1.417")
📌 Stem diameter: 5.50 mm (0.2155")
📌 Length: 3.080"
📌 Tulip angle: 20°
📌 Material: Stainless steel (EV8)
📌 Units: Each
📌 Vendor part number: 40-40652
Why choose this product?!
⭐ Black Diamond™ quality: precision engineering + advanced wear treatment for demanding engines
⭐ Built for reliability: one-piece forging and proven surface/coating technologies
⭐ Note: Requires use of a Kibblewhite spring kit (per manufacturer recommendation)
