Supertech Performance VWIVN-1010 Black Nitrided Intake Valve Oversize - 2mm

The Supertech Performance VWIVN-1010 is a +2mm oversized black nitrided performance intake valve engineered for high-output VW VR6 2.8L engine builds. Manufactured as a one-piece forged valve from an enhanced grade of EV8 (21-4N) stainless steel — the highest grade of steel available for this application — it delivers exceptional strength and durability under demanding conditions.

The valve features a Black Nitride surface treatment applied to the entire valve, not just the stem. This hardening process creates a microhardness of 800HV minimum, producing a finish that is smoother than traditional chrome-coated valves. The result is significantly reduced friction between the stem and guide, contributing to longer service life in high-performance applications.

Key Specifications:

• Head Diameter: 41.00mm (+2.0mm oversize)
• Stem Diameter: 6.97mm
• Overall Length: 105.95mm (4.171 in)
• Material: One-piece forged EV8 (21-4N) stainless steel
• Coating: Black Nitride (full valve coverage)
• Profile: Undercut and back-cut for improved flow

Key Features:

• One-piece forged construction for superior strength and reliability over multi-piece valves
• Undercut stem reduces valve weight and improves airflow around the stem
• Back-cut valve face enhances high-RPM flow characteristics
• Black Nitride coating bonds at a microscopic level — will not flake or delaminate even under impact
• Special heat treatment process optimized for the specific demands of the VR6 engine

Note that machine work is required when installing +2mm oversize valves. Sold individually (per valve). Order the quantity equal to the number of intake valves your engine requires.