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 a swirl polished
back for improved air flow and dished face for additional weight
reduction. Some Cosworth High Performance Valves are only compatible
with Cosworth Ultra Race Valve Spring Kits.