Supertech Performance MAIVN-1204-8 Black Nitrided Intake Valve for Mazda Miata - Set 1.8L

Supertech Performance MAIVN-1204-8 is a high-performance black nitrided intake valve set designed for Mazda Miata 1.8L engines. This set includes 8 valves and features a high-flow design with special valve stem shaping to maximize airflow and engine performance during cylinder head rebuilds.

Technical Specifications:

• Valve head diameter: 33.00mm (standard OEM size)
• Valve stem diameter: 5.97mm
• Overall length: 103.10mm (+1.1mm longer than OEM for improved performance)
• Material: EV8 (21-4N) forged stainless steel with black nitride coating
• Valve type: Intake
• Groove type: Single groove

Key Features:

• Manufactured from one-piece forged stainless steel for maximum strength and durability
• Black nitride surface treatment provides microhardness of 800HV minimum
• Smoother surface finish than chrome-coated valves for reduced friction between stem and guide
• Special high-flow valve stem shaping optimizes airflow characteristics
• Heat-treated to achieve optimal hardness while maintaining ductility beneath the nitrided layer
• Designed specifically for Mazda Miata 1.8L engines (1994-2005)
• Made in USA

Supertech valves are engineered using advanced technology including ultrasonic testing, x-ray analysis, laser measurement equipment, and computerized Finite Element Analysis (FEA). The black nitride coating is applied to the entire valve surface, providing superior wear resistance and reduced friction compared to chrome-coated alternatives. These valves are ideal for performance engine builds, head rebuilds, and racing applications where maximum durability and flow characteristics are essential.