Supertech Performance BMIVN-1030 Black Nitrided Stainless Steel Intake Valve STD

The Supertech Performance BMIVN-1030 is a high-performance, black nitrided stainless steel intake valve engineered for BMW engines. Built to standard (STD) dimensions of 33.00mm head diameter, 5.97mm stem diameter, and 106.10mm overall length, this triple-groove intake valve delivers the precision and durability demanded by performance and racing engine builders.

Manufactured as a one-piece forged valve from an enhanced EV8 (21-4N) stainless steel alloy, each valve undergoes a specialized heat treatment process to achieve optimal hardness for performance engine applications. The black nitride treatment is applied to the entire valve surface — not just the stem — bonding to the base material at a microscopic level for a finish that will not flake or delaminate, even under high-stress conditions such as valve-to-piston contact.

Key Features:

• Material: One-piece forged EV8 (21-4N) enhanced stainless steel alloy
• Head Diameter: 33.00mm (Standard)
• Stem Diameter: 5.97mm
• Overall Length: 106.10mm
• Groove Type: Triple groove
• Finish: Black nitride coating applied to entire valve
• Microhardness: 800HV minimum — higher than base stainless steel
• Smoother surface finish than chrome-stemmed valves, reducing friction between stem and guide
• Harder valve seat surface for extended durability with lead-free fuels, alcohols, nitro, and other aggressive fuel mixtures
• Nitrided layer is metallurgically bonded at a microscopic level — will not flake or crack under impact

Sold individually — per valve. Order the quantity equal to the number of intake valves required for your engine build (e.g., quantity of 12 for a 6-cylinder, 24-valve engine).