Description
If you’re pushing your engine beyond stock parameters, OEM valves and springs will become your bottleneck. The PROX 28.SES4409-1 replaces factory components with nitrided steel valves and premium chrome vanadium springs engineered to handle extreme RPMs and sustained high-load conditions without fatigue or failure. This kit bolts directly into your existing setup using OEM retainers, bases, and seals—no machine work required.
Built for serious builders and racers who demand reliability under stress, these components eliminate the weak link in your cylinder head and unlock the full potential of forced induction, high-rev builds, and aggressive tuning.
- Nitrided steel valves
- Increased hardness and wear resistance
- Chrome vanadium valve springs
- Premium spring material
- High-RPM rated design
- Handles increased valve weight
- Compatible with OEM retainers
- Compatible with OEM bases
- Compatible with OEM seals
- Intake or exhaust configuration
- Bolt-on installation
- No machine work needed
- MPN: 28.SES4409-1
