5/16 Valve Locks - 7 Degree GM LS Steel

The 5/16 Valve Locks - 7 Degree GM LS Steel from PAC Racing Springs are precision-engineered components designed for high-performance GM LS-series engine builds. Valve locks secure the valve spring retainer to the valve stem, preventing unwanted separation during extreme valve train acceleration and deceleration. These locks are essential for any serious LS engine upgrade, whether you're building a street performance machine or a competition powerplant that demands reliability under sustained high RPM operation.

Manufactured from hardened steel with a black oxide finish, these valve locks feature a 7-degree locking angle that matches OEM LS specifications while delivering superior holding force compared to stock hardware. The 5/16-inch valve stem size is standard for most LS applications, and the black oxide coating provides corrosion resistance and enhanced durability under thermal cycling. Each set contains 16 locks—enough for a complete eight-cylinder engine with dual valve trains—and the standard height profile ensures compatibility with factory and aftermarket valve spring packages without modification.

These valve locks are ideal for LS engine builders, performance shops, and enthusiasts upgrading stock valve train components or rebuilding cylinder heads for enhanced boost tolerance and RPM capability. Installation pairs with matching valve springs and retainers to form a complete, reliable valve train assembly. PAC Racing Springs' reputation for precision manufacturing ensures that each lock maintains tight tolerances and consistent geometry across the entire set, critical for balanced valve train operation and long-term engine stability.