Description
If you’re pushing your engine beyond stock parameters, OEM valves and springs will become a limiting factor—they’ll wear faster and struggle to keep up with aggressive cam profiles and high RPM operation. The PROX 28.SIS3406-2 kit upgrades both your valves and springs as a matched set, engineered to handle the demands of high-performance and racing applications. By replacing worn or marginal factory components with nitrided steel valves and premium chrome vanadium springs, you’ll gain durability, reliability, and the headroom to safely increase engine output.
- Nitrided steel valves
- Increased wear resistance
- Chrome vanadium springs
- High-RPM rated
- OEM-compatible installation
- Uses existing retainers
- Uses existing bases
- Uses existing seals
- Intake or exhaust config
- MPN: 28.SIS3406-2
