Supertech Performance NIVN-1042-12 Black Nitrided Intake Valve Set for Nissan RB20 +1mm Oversize

These high-performance valves feature a +1mm oversize design with a 31.10mm head diameter for increased airflow and power output.

Premium Construction:

• Forged from one-piece EV8 (21-4N) stainless steel for maximum strength and durability
• Black nitride coating provides superior wear resistance with minimum 800HV microhardness
• 5.97mm stem diameter with single groove design
• 107.50mm overall length optimized for hydraulic lifter applications
• Smoother surface finish than chrome coating reduces friction between stem and guide

Key Features:

• Enhanced heat treatment process ensures optimal hardness for high-performance applications
• Superior ductility beneath the hardened nitrided layer for reliability under extreme conditions
• Designed specifically for European and Japanese performance motors

Supertech valves are manufactured to the highest standards using the premium grade of stainless steel available, making them ideal for racing, turbo, and high-performance street applications. The black nitride finish is particularly suited for modern Japanese engines where durability and performance are critical.