Supertech Performance MAEVN-1204-8 Black Nitrided Exhaust Valve Set for Mazda Miata 1.8L

These high-performance valves are manufactured from one-piece forged stainless steel construction, delivering exceptional strength and durability for racing and high-performance street applications.

Key Specifications:

• Head Diameter: 28.00mm (standard size)
• Stem Diameter: 5.94mm
• Overall Length: 102.6mm
• Material: Forged stainless steel with black nitride coating
• Groove Type: Single groove

Black Nitride Coating Benefits:

• Microhardness exceeds 800HV while maintaining ductility beneath the hardened layer
• Smoother surface finish compared to chrome-coated valves
• Reduced friction between valve stem and guide for improved longevity
• Superior heat resistance and thermal fatigue protection
• Preferred coating for Japanese and European performance engines

Each valve undergoes a specialized heat treatment process calibrated to achieve optimal hardness levels for your specific engine application. Supertech valves are trusted by racers across all motorsport disciplines including drag racing, rally, and road racing. When rebuilding your cylinder head, these exhaust valves pair perfectly with upgraded valve springs and seals to maximize airflow and engine performance.