The KPMI Black Diamond exhaust valve is engineered from high-grade stainless steel using a specialized German impregnation process to significantly improve wear properties, reduce friction, and resist corrosion superior to traditional chrome and nickel electrolysis plating. Each valve features a precision one-piece forged design developed with Finite Element Analysis software and tested on computerized flow benches to maximize flow characteristics and long-term durability.

Designed specifically for classic Harley-Davidson Shovelhead engines, this lightweight, strong standard exhaust valve delivers outstanding valvetrain performance under demanding operating conditions. It provides an optimal replacement engineered to exact tolerances for enhanced valvetrain reliability and engine efficiency.

Key Features

Highlights

• One-piece forged stainless steel construction for maximum strength
• Black Diamond treatment reduces friction and improves corrosion resistance
• Engineered using Finite Element Analysis and computerized flow bench testing
• Designed for optimal valvetrain flow characteristics and durability

Compatibility

• Harley-Davidson Shovelhead 74" (1966–1977)
• Harley-Davidson Shovelhead 80" (1978–1983)