The Skunk2 Alpha Series Valves for Honda K20 and K24 engines are engineered for high-performance reliability and efficiency. Manufactured from HNV-3 martensitic steel (intake) and EV8 austenitic steel (exhaust), these one-piece forged valves deliver unmatched strength and resistance to extreme temperatures. Each valve undergoes proprietary heat treatment and hard chrome plating to reduce friction, enhance durability, and resist corrosion—making them ideal for both naturally aspirated and forced induction applications.

Skunk2’s Alpha Series Valves are designed with precision valve head profiles to maximize airflow and sealing performance, resulting in improved horsepower, throttle response, and combustion efficiency. These valves are part of Skunk2’s fully tested and race-proven valvetrain lineup, trusted in every Skunk2-built engine.

Key Features:

• Forged One-Piece Construction for ultimate strength and reliability

• HNV-3 Martensitic Steel (Intake) / EV8 Austenitic Steel (Exhaust) materials

• Hard Chrome Plated Finish reduces friction and resists corrosion

• Proprietary Heat Treatment increases strength and longevity

• Optimized Valve Head Profile for maximum airflow and sealing

• 3–10g Lighter Than Stock for improved engine response

• Standard Compression Dished Head Design

• Compatible with OEM and Aftermarket Valve Springs

• Designed and Tested In-House by Skunk2 Racing Engineers

Technical Specifications:

• Application: Honda K20 / K24 Engines

• Valve Type: Intake / Exhaust

• Head Diameter: 35.00mm (Intake) / 30.00mm (Exhaust)

• Stem Diameter: 5.48mm (Intake) / 5.45mm (Exhaust)

• Overall Length: 109mm (Intake) / 108.6mm (Exhaust)

• Material: HNV-3 & EV8 Stainless Steel Alloy

• Compression: Standard

• Finish: Hard Chrome Plated

• Weight: 3–10g lighter than OEM

Vehicle Fitment:

Compatible with the following Honda engine platforms:

• Honda K20 / K20A / K20Z

• Honda K24 / K24A / K24Z

Recommended Pairings (Sold Separately):

For the ultimate valvetrain performance and stability, Skunk2 recommends:

• Alpha Series Valve Springs and Ti Retainers – 344-05-1410

• Alpha Series Valve Springs – 311-05-1380

• Pro XP Valve Springs – 311-05-7380

• Pro Ti Retainers – 308-05-0410

• Spring Bases for Dual Springs – 312-05-0010

• Valve Seals (Required for Spring Base Install) – 312-05-0100

Included:

• (8) Intake Valves – 35mm

• (8) Exhaust Valves – 30mm