Where OEM Stops, Performance Begins
STK Racing Dual Valve Spring Kit + 6mm Chromoly Retainers
Honda B-Series & VTEC
When building a high-revving Honda B-Series or VTEC engine, the valvetrain becomes one of the most critical components in the entire setup. The STK Racing Dual Valve Spring Kit with 6mm chromoly retainers is designed specifically for performance applications where OEM components simply cannot keep up.
This is not a replacement part — it’s a performance upgrade engineered for engines that demand higher RPM stability, aggressive cam profiles, and long-term reliability under stress.
What’s Included in the Kit
The kit is supplied as a complete matched set to ensure consistent valvetrain control:
16 Inner and Outer Dual Valve Springs
16 x 6mm Chromoly Retainers
Designed seat pressure and open pressure to support performance camshafts
Built to handle higher lift and increased RPM operation
Each component is engineered to work together, eliminating compatibility guesswork and ensuring reliable performance once properly installed.
Why It’s Better Than OEM Valve Springs
1. Superior High-RPM Control
OEM valve springs are designed for comfort, emissions compliance, and long service intervals in stock engines. They are not intended for sustained high RPM use or aggressive camshaft profiles.
When engine speed increases beyond factory parameters, stock springs can struggle to maintain precise valve control. The STK dual-spring design significantly improves valve stability, allowing the engine to rev higher while maintaining accurate valve timing.
2. Reduced Valve Float
Valve float occurs when the spring cannot close the valve quickly enough at high RPM. This leads to:
Loss of power
Inconsistent timing
Increased risk of valve-to-piston contact
Potential catastrophic engine damage
The dual spring configuration uses two concentric springs working together to resist float and control valve motion more effectively than a single OEM spring. This is especially critical for track use, forced induction builds, or engines running high-lift camshafts.
3. Stronger and Lighter Chromoly Retainers
The included 6mm chromoly retainers offer improved strength compared to stock retainers while reducing overall valvetrain mass.
Lower reciprocating weight means:
Improved throttle response
More stable high-RPM operation
Reduced stress on valve train components
Better durability under performance conditions
Chromoly material provides exceptional tensile strength and fatigue resistance, making it ideal for performance applications.
4. Designed for Performance Builds
OEM valve springs are sufficient for daily driving at factory power levels. However, they are not engineered for:
Performance camshafts
Turbocharged or supercharged setups
Increased compression builds
Track or racing applications
The STK Racing Dual Valve Spring Kit is specifically built to support these modifications. It provides the seat pressure and control required to safely extract more power from a Honda B-Series or VTEC engine.
What You Can Expect After Installation
When installed and set up correctly by a qualified engine builder, this upgrade delivers:
Higher safe rev limits
Improved top-end power stability
Consistent valve control under load
Reduced risk of valvetrain failure
For anyone building a serious Honda performance engine, upgrading the valve springs is not optional — it is essential. The STK dual valve spring kit provides the strength, stability, and durability needed to support aggressive tuning while protecting your investment.
Final Thoughts
A performance engine is only as strong as its weakest component. In high-revving Honda builds, OEM valve springs quickly become that weak link.
The STK Racing Dual Valve Spring Kit with 6mm chromoly retainers removes that limitation. It delivers superior valve control, improved reliability at high RPM, and the durability required for serious street and track applications.
If you are pushing beyond stock power levels, this upgrade is not just better than OEM — it is necessary.