Manley Performance Valve Locks are precision-machined to securely retain the valve spring retainer to the valve stem, ensuring accurate valvetrain geometry and dependable performance. Available for both conventional and Manley Bead Loc® valve lock systems, they are manufactured from premium materials to exacting tolerances for a precise fit, exceptional durability, and reliable operation in high-performance street and racing engines. Whether you're rebuilding an engine or assembling a competition valvetrain, Manley Valve Locks provide the strength and confidence demanded by today's most powerful engine combinations.