The Skunk2 Alpha Valve Spring and Titanium Retainer Kit for Honda D16 VTEC engines is engineered to deliver unmatched valvetrain control, strength, and performance at high RPM. Designed through years of real-world racing and dyno testing, this kit combines dual high-tensile chrome-silicone valve springs with ultralight titanium retainers to reduce valvetrain mass, increase engine response, and support sustained operation at engine speeds exceeding 10,000 rpm.

Each Alpha spring is precision wound from super-clean chrome-silicone wire milled in Japan and paired in an inner/outer dual-spring design with slightly different frequencies. This configuration minimizes resonance, prevents valve float, and ensures consistent spring pressure across the entire rev range.

The included Alpha Titanium Retainers are precision CNC-machined from medical-grade titanium and optimized using 3D CAD and Finite Element Analysis (FEA) for ideal strength-to-weight characteristics. Their lightweight design significantly reduces valvetrain mass, improving throttle response and increasing power while maintaining long-term reliability.

Every retainer is serialized and quality inspected for dimensional accuracy, ensuring perfect fitment, valve seal clearance, and dependable performance under extreme racing conditions.

Key Features:

• Complete Dual Valve Spring and Titanium Retainer Kit

• Reduces Valvetrain Mass for higher RPM stability and quicker response

• Supports Engine Speeds Over 10,000 RPM

• Super-Clean Chrome-Silicone Dual Springs – inner and outer design with interference fit

• Medical-Grade CNC-Machined Titanium Retainers for maximum strength and minimal weight

• Radius-Cut Edges and Lightening Grooves for improved rocker arm clearance

• FEA-Optimized Design for ideal spring pressure and longevity

• Serialized for Quality Tracking and production traceability

• Dyno- and Race-Proven Performance in drag, road, and endurance applications

• Designed, Developed, and Tested In-House by Skunk2

Technical Specifications:

• Seat Pressure: 62 lbs

• Open Pressure: 168 lbs

• Max RPM Range: 10,000+

• Material (Springs): Chrome-Silicone Alloy (Japan)

• Material (Retainers): CNC-Machined Medical-Grade Titanium

• Design: Dual spring (inner/outer) with slight interference fit

• Compatibility: Honda D16Y / D16Z VTE

Vehicle Fitment:
Compatible with:

• Honda D16Y Series VTEC Engines

• Honda D16Z Series VTEC Engines

Included:

• (16) Dual Chrome-Silicone Valve Springs

• (16) Titanium Retainers

• (1) Installation Guide