8mm Valve Locks - Mini 8 Type - GM LS Stee

PAC Racing Springs 8mm Valve Locks – Mini 8 Type are precision steel components engineered for GM LS-series engine builds. These 8-degree valve locks are designed to secure 8mm valve stems at standard height, providing the critical retention needed in high-performance and street applications where valve train stability is essential. The set includes 16 pieces—enough for a complete eight-cylinder engine—finished in black oxide for corrosion resistance and clean aesthetics.

The Mini 8 design is engineered specifically for LS-platform applications, where valve stem diameter and lock geometry must match engine specifications precisely. The 8-degree angle promotes positive seating and reduces the risk of lock-to-stem slippage under the thermal cycling and valve acceleration loads that develop during extended driving or competition use. Steel construction with black oxide plating provides durability while resisting surface corrosion in engine bay environments. The standard-height profile maintains compatibility with factory rocker arm geometry and aftermarket LS cylinder heads designed for OEM-spec valve train dimensions.

These valve locks are essential for builders assembling complete LS engines, refreshing valve train components, or replacing worn factory locks. LS engine enthusiasts—whether building a crate engine for installation, servicing an existing platform, or upgrading to an aftermarket head setup—rely on precision locks to ensure that keepers remain seated and valves stay properly positioned throughout the engine's operating range. PAC Racing Springs valve locks are a trusted component choice in the LS community for both street and racing applications.

Proper valve lock selection is a critical detail often overlooked during engine assembly. Mismatched locks or worn keepers can lead to valve float, dropout, or damage under load. Specifying the correct lock diameter, angle, and height—as defined by your cylinder head and valve stem diameter—is non-negotiable. These PAC-L8141-16 locks are sized and angled for 8mm stems, making them incompatible with 11/32" stems or other lock types; verify your engine's specifications before ordering.