Supertech Performance HIVN-1020D-8 Black Nitrided Intake Valve Set for Honda K20/K24

These valves are manufactured from one-piece forged stainless steel and feature an advanced black nitride surface treatment that provides superior durability and performance compared to traditional chrome-coated valves.

Key Specifications:

• Head Diameter: 35.00mm (standard size)
• Stem Diameter: 5.48mm
• Overall Length: 108.85mm
• Material: Forged stainless steel with black nitride treatment
• Valve Type: Intake

Black Nitride Treatment Benefits:

• Microhardness of 800HV minimum for exceptional wear resistance
• Superior surface finish compared to chrome coating, reducing friction between stem and valve guide
• Enhanced corrosion resistance for daily driving and track use
• Treatment applied to entire valve surface, not just the stem
• Improved durability with lead-free fuels, alcohol, and high-performance fuel mixtures
• Nitrided layer adhered at microscopic level, preventing flaking or separation

Performance Features:

• Swirl polished finish for optimal airflow characteristics
• Hardened valve tips to extend valve train component life
• Controlled stem finish to reduce valve guide wear
• Stem undercut design for weight reduction and improved valve dynamics
• Reduces internal engine friction for maximum power output at high RPM

Supertech Performance leverages over 30 years of experience in manufacturing racing valves for drag racing, road racing, rally, and other motorsports applications. Each valve is precision-manufactured to deliver high flow rates, exceptional durability, and consistent performance under the most demanding conditions.

Note: This set includes intake valves only. For a complete valve replacement, you will need to purchase exhaust valves separately (8 exhaust valves required for K-series engines). Always verify stem-to-guide clearance during assembly and consult your machine shop or engine builder to ensure proper fitment and performance.