5/16 Valve Locks - 10 Degree Steel

The 5/16 Valve Locks - 10 Degree Steel by PAC Racing Springs are precision-engineered components designed for serious engine builders and high-performance mechanics who demand reliability under extreme valve train conditions. These locks are essential hardware for any valvetrain assembly where factory tolerances have been exceeded or aftermarket components demand superior retention.

These 10 Degree Steel locks secure your valve spring retainers to the valve stem, preventing unwanted movement and ensuring consistent performance in turbocharged, supercharged, and naturally aspirated builds. The tapered design matches the corresponding machined grooves on your valve stem, creating a mechanical lock that resists vibration and resonance-induced loosening across the RPM band.

Engine builders installing performance cam profiles, upgrading to stiffer valve springs, or rebuilding vintage race engines will benefit from these locks. The 5/16-inch sizing is compatible with a wide range of common valve stem diameters, making them versatile for single and dual-spring applications.