Forged Stainless Steel Intake Valves w/ Black Nitride Finish, 12 Piece Set

The Supertech Performance AIVN-1103-12 intake valve set provides a robust upgrade for Audi and VW 1.8T 5V engines. Constructed from a single piece of forged stainless steel, these valves are built for superior strength and longevity in demanding performance applications. A specialized heat treatment process is employed to achieve optimal hardness tailored for specific engine requirements, ensuring peak performance and reliability. The valves are finished with a black nitride coating, which offers several advantages over traditional chrome plating. This coating results in a smoother surface finish, significantly reducing friction between the valve stem and the guide, which can lead to decreased power loss at higher RPMs. Furthermore, the hardened valve seat surface created by the black nitride treatment provides enhanced durability and longevity, especially when used with various fuel types including lead-free fuels, alcohols, and nitro-based mixtures. This treatment ensures compatibility with a wide range of valve seat materials, such as nodular iron, steel powder metal, hard aluminum-copper, and beryllium copper. These valves are ideal for high-RPM applications, as the reduced valve-guide friction contributes to better engine efficiency. The nitrided layer adheres microscopically to the base material, preventing flaking or breakage even under impact from pistons. This set includes 12 valves, making it a comprehensive solution for a cylinder head build.