Description
If you’re pushing your engine to its limits, OEM valves and springs won’t cut it. The PROX Valve and Spring Kit 28.SIS4409-2 replaces stock components with nitrided steel valves and premium chrome vanadium springs engineered to handle the demands of high-RPM racing without fatigue or premature wear. This is a straightforward bolt-on upgrade that uses your existing retainers, bases, and seals—no machine work required.
- Nitrided steel valves
- Enhanced durability, extreme conditions
- Chrome vanadium valve springs
- High-RPM rated design
- Reduced wear characteristics
- Compatible OEM hardware
- Bolt-on installation
- Intake or exhaust configuration
