The Skunk2 Alpha Series Valves are precision-engineered for Honda D-Series VTEC engines, including the D16Z6, D16Y5, D16Y7, and D16Y8. Manufactured from premium HNV-3 martensitic steel (intake) and EV8 austenitic steel (exhaust) one-piece forgings, these valves deliver exceptional strength, reliability, and performance in both naturally aspirated and forced induction setups.

Each valve undergoes Skunk2’s proprietary heat-treatment process to maximize durability and is hard chrome plated to reduce friction and prevent corrosion. The optimized valve head design enhances airflow efficiency and combustion stability—translating to improved horsepower, torque, and throttle response.

Weighing up to 10 grams lighter than OEM valves, Skunk2 Alpha Valves provide faster valvetrain response and higher RPM capability, making them ideal for performance street builds and competitive racing engines.

Key Features:

• Manufactured from HNV-3 and EV8 Stainless Steel for intake and exhaust strength

• One-Piece Forged Construction for maximum reliability

• Proprietary Heat Treatment Process for extreme durability

• Hard Chrome Plated for reduced friction and corrosion resistance

• Optimized Valve Head Design for improved airflow and sealing

• 3–10g Lighter Than OEM Valves for faster valvetrain response

• Perfect Balance of Strength, Weight, and Flow

• Tested and Proven in Skunk2 Race Engines

• Direct OEM Replacement Fitment

Technical Specifications:

• Engine Compatibility: D16Z6, D16Y5, D16Y7, D16Y8

• Overall Length (Intake/Exhaust): 118.5mm / 116mm

• Head Diameter (Intake/Exhaust): 30.00mm / 26.00mm

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

• Design: Dished Head, Standard Compression

• Material: Stainless-Steel Alloy (HNV-3 / EV8)

• Finish: Hard Chrome Plated

• Weight Reduction: 3–10g lighter than OEM valves

Vehicle Fitment:

Compatible with the following Honda D-Series engines:

• Honda D15B / D15Y

• Honda D16Y / D16Z

Recommended Pairings (Sold Separately):

• Alpha Series Valve Springs & Titanium Retainers Kit – P/N 344-05-1350

• Alpha Series Valve Springs – P/N 311-05-1345

• Alpha Titanium Retainers – P/N 308-05-1600

Included:

• (8) Intake Valves – 30mm

• (8) Exhaust Valves – 26mm