Supertech Black Nitrided Exhaust Valve +1mm for Mazda/Ford Duratec 2.0/2.3/2.5

High-Performance Stainless Steel Black Nitride Exhaust Valves Valves for Mazda MZR 2.5

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 Flat face profile, and measures Oversize +1mm in diameter, with an overall length of 103.40mm. 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

Flat face style improves combustion efficiency

103.40mm 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