Description
If you’re pushing your engine to its limits, OEM valve springs won’t cut it—they’re designed for stock RPM ranges and can’t handle the demands of high-performance driving. The PROX Valve and Spring Kit 28.SIS4338-2 upgrades you to nitrided steel valves paired with premium chrome vanadium springs engineered to maintain valve control and durability when others fail. This is a direct bolt-on replacement that leverages your existing hardware while delivering the reliability serious racers and built engines demand.
- Nitrided steel valves
- Increased surface hardness
- Reduced valve wear
- Chrome vanadium springs
- High-RPM rated
- Stronger spring load
- Handles increased valve mass
- Uses OEM retainers
- Uses OEM bases
- Uses OEM seals
- Bolt-on installation
- Intake or exhaust configuration
