Supertech Performance MAEVN-2301F Black Nitrided Exhaust Valve - Single

The Supertech Performance MAEVN-2301F is a precision-engineered, single black nitrided exhaust valve designed for the Ford/Mazda Duratec 2.0L and 2.3L engine family. Manufactured from Stainless Steel 23-8N, this valve features a standard 30.00mm flat head diameter, a 5.48mm stem diameter, and an overall length of 103.40mm. It is sold individually — order one valve per cylinder required.

Key Specifications:

• Head Diameter: 30.00mm (Standard), Flat Face
• Stem Diameter: 5.48mm
• Length: 103.40mm
• Material: Stainless Steel 23-8N
• Finish: Black Nitride coating
• Groove Type: Single Groove
• Valve Type: Exhaust
• Sold: Per Valve (Individual)

Supertech Black Nitride Advantage:

• Black Nitride treatment is applied to the entire valve — not just the stem — for comprehensive surface hardening
• Achieves a minimum microhardness of 800HV, while maintaining ductility beneath the hardened layer
• The nitrided layer bonds at a microscopic level and will not flake or crack under impact
• Combined with Supertech's stem Superfinishing process, surface roughness is reduced to one-third that of chrome-coated valves, resulting in less friction between stem and guide
• Each valve tip is hardened beyond 52HRc for maximum durability

Manufacturing Process:

• One-piece forged construction using a two-step forging process for superior grain flow and strength
• CNC machined in multiple steps for strict dimensional tolerances
• Additional heat treatment applied for stress relief prior to nitride hardening
• Final precision grinding and patented Superfinishing technique for flawless surface finish

Supertech validates every valve design through ultrasonic testing, X-ray inspection, laser measurement, and computerized Finite Element Analysis (FEA), and works closely with professional engine builders to drive continuous improvement. The MAEVN-2301F is an ideal upgrade for naturally aspirated, turbocharged, or high-revving performance engine builds.