Supertech Performance NIVN-1007-8 Black Nitrided Intake Valve Set Oversize Nissan - 1mm SR20DE SR20DET

These +1mm oversize performance valves are precision-manufactured from enhanced EV8 (21-4N) stainless steel, the highest grade available for superior strength and durability in demanding applications.

Advanced Manufacturing Process:

• One-piece forging with slow two-step process for optimal material grain flow
• Multi-step CNC machining for precise final dimensions
• Heat treatment for stress relief followed by black nitride hardening treatment
• Final grinding with patented Superfinishing process for flawless surface quality
• Black nitride coating provides harder surfaces, smoother finishes, and reduced friction

Specifications:

• Head Diameter: 35.15mm (+1.0mm oversize)
• Stem Diameter: 5.97mm
• Length: 101.40mm
• Material: Stainless Steel 21-4N with Black Nitrided coating
• Groove Type: Single Groove

Supertech valves are manufactured with strict dimensional tolerances and feature finished seats with tight run-out tolerances for superior sealing, optimal performance, and easier installation. The black nitride coating reduces surface roughness significantly compared to chrome-coated alternatives, delivering unsurpassed performance and extended service life in high-performance engine builds.