Large diameter valves are essential for improved air flow. Cosworth high performance intake valves are produced from high quality stainless steel for maximum durability. Exhaust valves are machined from Inconel for
high temperature (2400 F) reliability. Each valve features swirl polished back for improved air flow and dished face for additional weight reduction. Cosworth high performance valves are compatible with Cosworth Ultra
Race Valve Spring kits.