Description
High-RPM engines demand valve components that can withstand extreme temperatures, pressure cycles, and mechanical stress without compromising reliability. The PROX Valve and Spring Kit 28.SIS3407-2 replaces factory valves and springs with nitrided steel valves and premium chrome vanadium springs engineered to deliver consistent performance in forced induction and naturally aspirated builds. This is a bolt-on upgrade using your existing retainers and seals—no machine work required.
- Nitrided steel valves
- Reduced wear, extreme conditions
- Chrome vanadium springs
- High-RPM rated design
- Stronger spring load
- Accommodates steel valve weight
- OEM retainer compatible
- OEM base compatible
- OEM seal compatible
- Intake or exhaust config
- Bolt-on installation
- MPN: 28SIS34072
