Supertech Performance HEVI-1008 Inconel Exhaust Valve Oversize - 1mm

The Supertech Performance HEVI-1008 is a +1mm oversize Inconel exhaust valve engineered for high-performance and forced-induction engine builds. Constructed from Inconel 751 nickel-base superalloy, this valve is purpose-built to withstand the extreme thermal demands of turbocharged and supercharged applications where standard stainless steel valves fall short.

Key Specifications:

• Head Diameter: 31.00mm (+1mm oversize)
• Stem Diameter: 5.45mm
• Overall Length: 106.45mm
• Material: Inconel (Nickel-Base Superalloy)
• Valve Type: Exhaust
• Face Type: Dish
• Groove Type: Single Groove

Key Features:

• One-piece forging for maximum structural integrity and long-term reliability
• Inconel nickel-base superalloy construction — the same class of material used in aerospace and motorsport for superior oxidation resistance and high-temperature strength
• Hardened tip for reduced wear at the rocker or follower contact point
• Superfinish stem for reduced friction against the valve guide and improved longevity
• Ideal for turbo, supercharged, and high-compression engine builds where exhaust temperatures are elevated beyond the range of standard stainless valves

Supertech Performance has been manufacturing precision racing valvetrain components for over 20 years, combining intensive dyno and engine-builder testing with state-of-the-art processes including ultrasonic inspection, laser measurement, and Finite Element Analysis (FEA). The result is a valve with exceptional fatigue resistance, precise seat geometry, and consistent dimensional tolerances.

Sold individually — per valve. Order the quantity equal to the number of exhaust valves required for your engine build.