Description
If you’re pushing your engine to its limits, OEM valves and springs become your limiting factor. The PROX 28.SIS4335-2 Kit replaces them with nitrided steel valves and premium chrome vanadium springs engineered to handle extreme RPMs and sustained high-load conditions without compromising reliability. This is a direct bolt-on upgrade that uses your existing retainers and seals—no fabrication required.
- Nitrided steel valves
- Reduced wear, extreme conditions
- Chrome vanadium valve springs
- High-RPM rated design
- Intake or exhaust configuration
- OEM-compatible installation
- Uses existing retainers/seals
- MPN: 28.SIS4335-2
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