Supertech Performance HIVN-1035D Black Nitride Intake Valve Stainless 21-4N +1.0mm Oversize

The Supertech Performance HIVN-1035D is a Black Nitrided intake valve engineered for high-performance and racing applications. Manufactured from 21-4N (EV8) stainless steel alloy and built as a one-piece forged component, this valve delivers exceptional strength, heat resistance, and long-term durability under demanding engine conditions.

Key Specifications:

• Head Diameter: 36.00mm (+1.0mm oversize)
• Overall Length: 106.85mm
• Material: Stainless Steel 21-4N (EV8)
• Groove Type: Single Groove
• Finish: Black Nitride Coating
• Valve Type: Intake

Key Features:

• Black Nitride Treatment: A hardening surface treatment that produces a smoother finish than chrome-coated valves, resulting in reduced friction between the valve stem and guide and improved longevity.
• One-Piece Forged Construction: Provides superior structural integrity and reliability compared to multi-piece alternatives.
• 21-4N (EV8) Stainless Steel: A high-nickel, high-temperature alloy selected for its excellent resistance to heat and wear in performance and racing environments.
• Microhardness: Nitrided layer achieves a minimum hardness of 800HV while maintaining ductility beneath the surface for resilience under stress.
• CNC Finished: Machined to strict tolerances for consistent performance and fitment.

Supertech Performance valves are backed by over 20 years of manufacturing experience and are developed in close collaboration with professional engine builders. The HIVN-1035D is sold per valve — order the quantity that matches your engine's total intake valve count.