Supertech Performance SEVN-1010-8 Black Nitrided Exhaust Valves for Subaru EJ20/EJ25

These high-performance valves are manufactured from one-piece forged stainless steel 23-8N material, providing exceptional strength and durability for demanding street performance and racing applications.

Key Specifications:

• Head Diameter: 32.00mm (standard size)
• Stem Diameter: 5.96mm
• Length: 104.70mm (standard)
• Material: Stainless Steel 23-8N with black nitride treatment
• Groove Type: Single groove
• Set quantity: 8 exhaust valves

Manufacturing Excellence:

• One-piece forged construction for superior grain flow and strength
• CNC machined in multiple steps for precise dimensions
• Black nitride hardening treatment provides smooth surface and reduced friction between stem and guide
• Undercut stem and back-cut angle design
• Magnetic friction welded wafer hardened to 52 HRC minimum
• Precision ground with patented Superfinishing technique

Supertech valves undergo a specialized two-step forging process followed by heat treatment for stress relief, ensuring optimal hardness and ductility. The black nitride coating offers superior performance compared to chrome plating, producing less friction and better wear resistance in high-temperature turbocharged applications. These valves are ideal for Subaru WRX, STI, Forester, and other models equipped with EJ20 or EJ25 engines.