High-Performance Inconel Exhaust Valves Valves for a VW EA888 Supertech Engine Valves are engineered for high-performance street and racing applications, delivering exceptional strength, heat resistance, and precise fit. Production begins with a one-piece forging, where the head is formed under a slow two-step process to maintain optimal material grain flow. Each valve undergoes multiple CNC machining steps, stress-relieving heat treatments, and either nitride hardening or application-specific coatings. Final grinding and our patented Superfinishing process ... With over 30 years of racing valve development, Supertech combines this deep experience with state-of-the-art manufacturing and testing technology including ultrasonic inspection, x-rays, laser measurement, and Finite Element Analysis (FEA). In collaboration with top engine builders, we conduct continuous testing to refine every valve for high flow, extreme durability, and world-class performance. This valve features a Single Groove lock groove, a Dished face profile, and measures Oversize +1mm in diameter, with an overall length of 101.80mm. Built to precise standards, it ensures optimized airflow and long-term reliability. Features Single Groove lock groove design for secure valve retention Oversize +1mm valve diameter for optimal flow characteristics Dished face style improves combustion efficiency 101.80mm total valve length ensures proper fit and seating High-performance materials for strength, fatigue resistance, and thermal stability Benefits Improved airflow and volumetric efficiency Consistent performance under high boost and RPM Reduced wear and extended valve train life Ideal for naturally aspirated, turbocharged, or nitrous applications Specification Specs Engine Length 101.80mm Stem Diameter 5.96mm Head Diameter 29.00mm(+1) Material inconel-nimonic Groove Type single groove Engines Make Engine Audi EA113 Audi EA888 Audi TFSI VW EA113 VW EA888 VW TFSI