Supertech Performance TEVN-1020-8 Black Nitrided Exhaust Valve Set Toyota 4AGE 16V

The Supertech Performance TEVN-1020-8 is a black nitrided exhaust valve set designed for Toyota 4AGE 16V engines. This set includes eight high-performance exhaust valves engineered to deliver enhanced durability and reduced friction for street and racing applications.

The black nitride coating provides reduced friction, wear resistance, and long service life. The microhardness is higher than the stainless steel base material, keeping good ductility beneath the hard nitrided layer (microhardness is 800HV minimum). The surface finish is smoother than with chromed stems, having less friction between stem and guide, which is especially beneficial for high-RPM applications.

Key Features:

• Manufactured from EV8/21-4N stainless steel with black nitride treatment
• Swirl polished with stem undercut and hardened tip
• Black nitride surface helps reduce friction and scuffing while improving wear and corrosion resistance
• Ideal for street and moderate boost applications
• Harder seat surface lasts longer with lead-free fuels, alcohols, or other performance fuel mixtures
• Made in USA with precision manufacturing standards

Supertech uses more than 20 years of manufacturing racing valves experience, along with computerized Finite Element Analysis (FEA), working closely with engine builders to ensure high flow rates, durability and quality. The black nitride treatment provides superior protection compared to traditional chrome coatings, offering better resistance to modern fuel formulations and high-temperature operation.

This valve set is designed for naturally aspirated and moderate boost applications. For sustained high exhaust gas temperatures or extreme racing conditions, Inconel exhaust valves may be recommended. Professional installation and proper valve train setup is required for optimal performance and longevity.