Supertech Performance AEVN-1103 Black Nitride Stainless Steel Exhaust Valve

The Supertech Performance AEVN-1103 is a high-performance black nitrided stainless steel exhaust valve engineered for high-RPM, high-heat engine applications. Featuring a 29.90mm head diameter, 5.94mm stem diameter, and 103.90mm overall length, this valve is manufactured to stock OE dimensions with a standard triple-groove keeper setup, making it a direct-fit upgrade for compatible engines.

Key Features:

• One-piece forged EV8 (21-4N) stainless steel construction — delivers superior strength and reliability over multi-piece designs
• Black Nitride surface treatment — applied to the entire valve (not just the stem), producing a harder surface than chrome coating with a minimum microhardness of 800HV while retaining ductility beneath the treated layer
• Smoother stem finish than chrome — reduces friction between valve stem and guide for improved longevity and reduced guide wear
• Nitrided layer is bonded at a microscopic level — will not flake or crack under impact stress, including valve-to-piston contact events
• Standard OE head diameter with factory triple-groove keeper compatibility
• Swirl-polished valve head with validated seat geometry for stable, consistent flow
• Hardened valve tip for reduced wear against rocker arms or followers

The AEVN-1103 is ideal for street performance and moderate-boost turbocharged builds where elevated exhaust gas temperatures demand a more durable valve material than OEM. For extreme-duty turbocharged, supercharged, or endurance racing applications with sustained high exhaust gas temperatures, Supertech also offers the Inconel variant (AEVI-1103), which provides greater hot strength under prolonged thermal load.

Sold individually (per valve). Verify the total valve count for your specific engine configuration and order the appropriate quantity.