Supertech Performance BMEVN-1030S-8 Black Nitride Exhaust Valves for BMW M42/M50/M52/S50/S52/M54

Supertech Performance exhaust valves are engineered for high-performance BMW engines requiring superior durability and heat resistance.

Key Features:

• One-piece forged stainless steel construction (EV8 21-4N alloy) for maximum strength and reliability
• Black nitride hardening treatment for enhanced wear resistance and reduced friction
• Microhardness of 800HV minimum, exceeding base stainless steel material
• Smoother surface finish than chrome-coated valves, reducing stem-to-guide friction
• Superior valve seat hardness for extended durability with lead-free fuels, alcohol, and nitro mixes
• Special heat treatment process optimized for European performance engines
• Single groove design requires compatible single groove keepers (KPR-6S/7)

Each valve undergoes precision manufacturing and rigorous testing developed through over 30 years of collaboration with professional engine builders. The black nitride coating provides excellent ductility beneath the hardened surface layer while maintaining superior thermal resistance for turbocharged and high-performance applications.