5/16 Valve Locks - 8 Degree +.050

The 5/16 Valve Locks - 8 Degree +.050 from PAC Racing Springs are precision-engineered components designed for high-performance engine builders and mechanics working with modified valve trains. These valve locks secure the valve stem to the rocker arm assembly, maintaining proper valve geometry under extreme RPM and boost conditions. Built for serious enthusiasts who demand reliability in competition engines, street performance builds, and heavily modified automotive applications, this set of 16 locks delivers the precision fit required when running custom valvetrain combinations.

These valve locks feature an 8-degree angle geometry that matches most modern cylinder head designs and a +.050-inch height specification, providing the clearance adjustment needed when combining aftermarket pushrods, rocker arms, or custom valve lengths. Manufactured from hardened steel with black oxide finish for corrosion resistance, the locks are precision-machined to PAC Racing Springs' exacting tolerances to ensure consistent seating and prevent valve float during sustained high-RPM operation. The 5/16-inch valve stem diameter specification makes these locks compatible with many small-block and big-block performance engines, and the .050-inch height increase compensates for valvetrain geometry changes common in turbocharged, supercharged, or nitrous-fed builds.

Professional engine builders and hardcore performance enthusiasts rely on PAC Racing Springs valve locks to eliminate valve stem slippage and maintain critical valve clearances throughout the RPM band. The set of 16 locks ensures you have complete coverage for dual overhead cam or pushrod engines requiring matched pairs, and the precision fit eliminates the guesswork when assembling valvetrain assemblies on freshly ported or modified cylinder heads. Proper installation requires valvetrain geometry verification and correct preload—consult your engine builder's specifications or cylinder head documentation to confirm compatibility with your rocker arm type, pushrod length, and desired valve lash settings.