Supertech Performance HIVN-1004-0 Black Nitrided Intake Valve 31.00mm

The Supertech Performance HIVN-1004-0 is a Black Nitrided intake valve engineered for high-performance and racing engine builds. Featuring a 31.00mm (standard) head diameter, 6.57mm stem diameter, and 105.40mm overall length, this valve is precision-manufactured from one-piece forged stainless steel using EV8 (21-4N) alloy for exceptional strength and reliability.

The Black Nitride treatment sets this valve apart from chrome-coated alternatives. The nitriding process is applied to the entire valve surface—not just the stem—creating a hardened layer bonded at the microscopic level for superior durability and performance.

Key Features:

• One-piece forged stainless steel construction using EV8 (21-4N) alloy for maximum strength
• Full-valve Black Nitride treatment with a minimum microhardness of 800HV
• Smoother stem surface than chrome-coated valves, reducing friction between stem and guide
• Harder valve seat surface for improved longevity with lead-free fuels, alcohols, and high-octane blends
• Compatible with nodular iron, steel powder metal, hard aluminum-copper, and beryllium copper valve seats
• Nitrided layer bonds microscopically to the base material and will not flake or fracture under impact
• Reduces valve-guide friction at high RPM, minimizing parasitic power loss

Specifications:

• Head Diameter: 31.00mm (standard)
• Stem Diameter: 6.57mm
• Overall Length: 105.40mm
• Material: Black Nitrided Stainless Steel (EV8 / 21-4N)
• Valve Type: Intake

Sold individually — order the quantity equal to the number of intake valves required for your engine build.