Supertech Performance MAIVN-2304F-8 Black Nitride Intake Valves +1mm Oversize Mazda Ford Duratec 2.0L 2.3L

These valves feature a +1mm oversize head diameter for improved airflow and are engineered to handle the demands of high-performance street, turbocharged, and racing applications.

Key Features:

• Head Diameter: 36.00mm (+1.0mm oversize) with flat face design
• Stem Diameter: 5.48mm with single groove configuration
• Overall Length: 103.40mm standard length
• Material: Premium EV8 (21-4N) stainless steel construction
• Black nitride surface treatment for reduced friction and enhanced durability
• Undercut and backcut valve head for optimized flow characteristics
• Stem superfinishing reduces surface roughness for improved performance
• Valve tip hardened beyond 52HRc for extended service life

Supertech valves are manufactured using over 30 years of racing experience combined with advanced technologies including ultrasonic testing, x-ray inspection, laser measurement, and Finite Element Analysis (FEA). The black nitride treatment provides a smoother surface finish compared to chrome coating, reducing friction between the valve stem and guide while increasing wear resistance. Each valve is precision-forged from a single piece of stainless steel and features strict dimensional tolerances for optimal sealing and easy installation.

Important Installation Notes:

• Oversize valves require upgraded valve guides and seals for proper installation
• Valve seats must be machined to accommodate the larger head diameter
• For Mazdaspeed 3 and Mazdaspeed 6 applications, use with Supertech valve guides and seals only
• Verify piston-to-valve clearance at planned lift and timing before installation

These performance intake valves are ideal for engine builders and enthusiasts seeking increased airflow, improved high-RPM stability, and enhanced reliability in naturally aspirated, turbocharged, and supercharged Duratec engine builds.