Black Diamond Exhaust Valve Fits HD Sportster 1957-1969

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The Kibblewhite Black Diamond Exhaust Valve is a high-performance stainless steel valve designed for durability and efficiency. It undergoes a specialized German nitriding process, which impregnates the valve to a depth of .002" with a surface buildup of .0002". This treatment enhances wear resistance, reduces friction, and provides superior protection against corrosion compared to chrome and nickel electrolysis plating. Constructed as a lightweight, one-piece forging, the valve features an optimized profile for excellent flow characteristics. It is compatible with both leaded and unleaded fuels and can be used in cast iron or bronze guides with close tolerances, ensuring effective oil control and heat dissipation.