Supertech Performance BMIVN-1031S Black Nitrided Intake Valve Oversize Single Groove - 1mm

The Supertech Performance BMIVN-1031S is a Black Nitrided forged stainless steel intake valve engineered for high-performance BMW engines. Sized at +1mm oversize, this single-groove intake valve features a 34mm head diameter, 5.97mm stem diameter, and an overall length of 106.10mm. It must be used with keeper KPR-6S7 (sold separately).

Key Specifications:

• Valve Type: Intake
• Head Diameter: 34mm (+1mm oversize)
• Stem Diameter: 5.97mm
• Length: 106.10mm
• Material: Forged Stainless Steel — Black Nitrided
• Groove Type: Single Groove
• Required Keeper: KPR-6S7

Black Nitride Treatment Advantages:

• Applied to the entire valve surface — not just the stem — for complete, uniform protection
• Microhardness of 800HV minimum, exceeding the base stainless steel material while retaining ductility
• Smoother surface finish than chrome-coated stems, reducing friction between the valve stem and guide
• Harder valve seat surface for improved durability with lead-free fuels, alcohols, nitro, and other aggressive fuel mixtures
• Nitrided layer bonds at a microscopic level and will not flake or crack under impact stress

Supertech Performance valves are manufactured from one-piece forged stainless steel, primarily using EV8 (21-4N) alloy, and undergo a specialized heat treatment process calibrated for each specific engine application to deliver the optimal balance of hardness and strength. Supertech's continuous development process — driven by intensive testing and direct collaboration with professional engine builders — ensures these valves meet the rigorous demands of drag racing, road racing, rally, and other competitive motorsport disciplines.

Sold individually (per valve). Order the quantity matching the number of intake valves required for your engine build.