5/16 Valve Locks - Mini 8 Degree Steel

The 5/16 Valve Locks - Mini 8 Degree Steel by PAC Racing Springs are precision-engineered components designed for high-performance engine builds where valve control and reliability are non-negotiable. These locks secure the valve spring retainer to the valve stem, preventing unwanted movement during aggressive cam profiles and extreme RPM conditions.

Manufactured from hardened steel, the 5/16 valve locks feature an 8-degree angle geometry that ensures positive engagement with the valve stem groove while minimizing binding and rotational stress. The mini profile reduces weight and clearance requirements compared to standard locks, making them ideal for tight rocker arm geometries and custom cylinder head porting.

PAC Racing Springs' precision manufacturing guarantees consistent lock-to-stem contact, which is critical for preventing catastrophic valve float and maintaining valve train integrity under sustained high-RPM operation. These 5/16 valve locks are compatible with small-block and compact engine platforms using 5/16-inch diameter valve stems, including many LS-based engines, classic muscle car builds, and purpose-built race motors.