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Supertech Performance MAEVN-2304F Black Nitride Exhaust Valve +1mm Oversize

(2003-2014 Ford Focus; 2005-2015 Ford Escape; 2006-2015 Ford Fusion; 2014-2015 Ford Transit Connect; 2004-2013 Mazda 3; 2003-2008 Mazda 6 + 4 more models)

Manufacturer

Picture for manufacturer Supertech Performance

Part Number

MAEVN-2304F
10 reviews
Sale Price

$21.27

Estimated ship date Wednesday, November 25

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Product Details

The Supertech Performance MAEVN-2304F is a high-performance black nitrided exhaust valve designed as a +1.0mm oversize replacement for Ford Duratec and Mazda MZR 2.0L/2.3L engines. Built from premium Stainless Steel 23-8N, this one-piece forged valve delivers superior strength, heat resistance, and long-term durability for performance street and competition builds.

Each valve is precision CNC-machined through multiple operations to achieve exact dimensions, then subjected to a specialized Black Nitride hardening treatment that bonds to the base material at a microscopic level. This surface treatment increases microhardness (800HV minimum) while maintaining ductility beneath the hardened layer, resulting in reduced friction between the valve stem and guide and improved wear resistance over chrome-coated alternatives.

Key Specifications:

  • Part Number: MAEVN-2304F
  • Type: Exhaust Valve
  • Head Diameter: 31.00mm (+1.0mm oversize)
  • Head Profile: Flat
  • Stem Diameter: 5.48mm
  • Length: 103.40mm
  • Material: Stainless Steel 23-8N
  • Coating: Black Nitride
  • Groove Type: Single Groove

Manufacturing Process:

  • One-piece forged construction with two-step head forging for optimal grain flow and strength
  • Multi-step CNC machining for exact dimensional tolerances
  • Heat treatment for stress relief followed by Black Nitride hardening
  • Precision grinding and Superfinishing technique for flawless surface finish
  • Hardened tips to extend follower and guide life

The Black Nitride treatment is applied across the entire valve surface — not just the stem — providing consistent friction reduction at high RPM and making it an excellent choice for naturally aspirated and moderately boosted applications. For sustained high exhaust gas temperature (EGT) environments or endurance racing, Supertech also offers Inconel exhaust valve variants for this application.

Sold individually (per valve). Order the quantity equal to the number of exhaust valves your engine requires.

Products specifications

Fits

2003-2014 Ford Focus; 2005-2015 Ford Escape; 2006-2015 Ford Fusion; 2014-2015 Ford Transit Connect; 2004-2013 Mazda 3; 2003-2008 Mazda 6; 2006-2010 Mazda 5; 2007-2012 Mazda CX-7; 2006-2011 Mercury Milan; 2005-2008 Mercury Mariner

Head Dia

31.00mm (+1.0)

Length

104.70mm

Material

Black Nitrided

Stem Dia

5.48mm

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