Supertech Performance MEVN-1009-8 Black Nitrided Exhaust Valve Set for Mitsubishi - 4G63

These performance valves feature a +1mm oversize design with a 31.50mm head diameter, providing increased flow over the standard 30.50mm valves for improved engine performance.

Key Features:

• One-piece forged stainless steel construction for maximum strength and reliability
• Black nitride coating for superior durability and heat resistance
• 31.50mm head diameter (+1mm oversize)
• 6.54mm stem diameter
• 109.6mm overall length
• Superfinished stem surface reduces friction and improves valve guide life
• Microhardness rating of 800HV minimum on nitrided layer
• Single groove design for compatibility with standard valve locks

Manufacturing Excellence:

• Two-step forging process ensures optimal grain flow and strength
• CNC machined to exact tolerances for precise fitment
• Specialized heat treatment for stress relief
• Patented Superfinishing technique for flawless surface finish
• Hardened valve tips exceed 52 HRC for extended wear life

The black nitride treatment provides superior performance compared to chrome-coated valves, offering better heat resistance, reduced friction, and improved durability with lead-free fuels, alcohol, and high-boost applications. The nitrided layer adheres at a microscopic level and won't flake or chip even under extreme conditions. Ideal for turbocharged and high-performance street or racing applications.

Set Includes: 8 exhaust valves (complete set for 4-cylinder engine)

Note: Use with Supertech valve lock KPR-50/7S.