
Valve Black Diamond™ by KIBBLEWHITE — manufacturer reference: 20-4171. Designed for Vintage/Classic and Road/Touring machines, this one-piece intake valve provides strength and precision for the demanding cylinder heads of large twin engines.
Machined from stainless steel with a Stellite tip, the valve is enhanced by a special nitriding process (depth 0.002" and surface layer 0.0002") improving wear resistance and reducing friction without the use of hard chrome. Lightweight and streamlined, it offers good flow characteristics while remaining compatible with both leaded and unleaded fuels.
Ideal for restorations and builds where durability and consistency of valve clearance are paramount. Common mounting examples: Harley-Davidson FXSTS/FXSTB/FXST 1340 (1999). Perfect for riders looking for a robust part designed to last in a traditional engine.