Supertech Performance BMIVN-1031 Black Nitrided Intake Valve BMW Oversize - M50 M52 S50 S52 34mm 1mm

The Supertech Performance BMIVN-1031 is a high-performance black nitrided intake valve designed for BMW 4-cylinder and 6-cylinder engines including M42, S42, M50, S50, M52, S52, and M54 applications. This valve features a +1mm oversize head diameter of 34mm, providing increased airflow potential for performance engine builds.

Key Specifications:

• Head Diameter: 34mm (+1mm oversize)
• Stem Diameter: 5.97mm
• Overall Length: 106.10mm
• Material: One-piece forged EV8 (21-4N) stainless steel
• Coating: Black nitride for superior hardness and durability
• Groove Type: Single groove design
• Requires valve keepers: KPR-6S/7 (sold separately)

Performance Features:

• Manufactured from one-piece forged stainless steel for maximum strength and reliability
• Black nitride coating provides microhardness of 800HV minimum with excellent ductility beneath the hard surface layer
• Smoother surface finish than chrome-coated valves, reducing friction between stem and guide
• Harder valve seat surface for extended durability with lead-free fuels, alcohol, and high-performance fuel mixtures
• Special heat treatment process optimized for each engine application
• Single groove design protects valve stem and reduces rotational wear compared to triple groove designs

Installation Notes:

This is a +1mm oversize valve requiring cylinder head machining or aftermarket valve seats for proper installation. Oversized valves are not a direct drop-in replacement and must be professionally installed by a qualified machine shop or engine builder. Valve stem seals and keepers are sold separately. Valves are sold individually—order the appropriate quantity for your engine application.

Supertech Performance combines over 30 years of manufacturing experience with cutting-edge technology to produce race-proven valve train components trusted by professional engine builders and motorsports enthusiasts worldwide.