Supertech Performance BMIVN-1010 Black Nitrided Intake Valve Triple Groove - 39mm 2mm

The Supertech Performance BMIVN-1010 is a high-performance forged stainless steel intake valve engineered for demanding race and performance engine builds. Featuring a +2mm oversized 39.00mm head diameter, 6.98mm stem diameter, and triple groove stem design, this black nitrided valve is a direct-fit performance upgrade. It is sold individually — order the quantity needed to match your engine's valve count.

Key Features:

• One-Piece Forged Construction: Manufactured from a single forging of EV8 (21-4N) stainless steel alloy for superior strength, fatigue resistance, and long-term durability
• Black Nitride Coating: A full-valve hardening treatment that achieves a minimum surface microhardness of 800HV — harder and smoother than conventional chrome-coated stems — resulting in reduced friction between the valve stem and guide
• Bonded Nitride Layer: The nitrided layer adheres at a microscopic level, preventing flaking or fracturing even under valve-to-piston contact events
• Triple Groove Stem: Compatible with OEM-style valve keepers, simplifying installation in performance builds
• Oversized Head Diameter: At +2mm over stock, the larger valve head improves cylinder head airflow for increased performance potential
• Precision Specifications: Head Diameter: 39.00mm (+2mm) | Stem Diameter: 6.98mm | Length: 121.40mm

Supertech's black nitride process is applied to the entire valve surface — not just the stem — providing uniform hardness and a consistently smooth finish throughout the valve's service life. This treatment is especially popular in European and Japanese performance engine applications where reduced stem friction and superior wear resistance are critical. Sold per valve — order the quantity required for your specific engine build.