COMP Cams 7 Valve Locks - Hardened Steel - Single Groove - 5/16" - (Set of 16) HXY2021 The outer layer covering is

The outer layer covering is soft

and our Advanced Axis Adjustment system allowing you to adjust shoulder width

2008-2009 Dodge Challenger

1975-1980 Chevrolet P10

COMP Cams 7 Valve Locks - Hardened Steel - Single Groove - 5/16" - (Set of 16) HXY2021 The outer layer covering isMost people believe that the tang inside a valve lock is what actually holds the valve spring retainer and spring in place while the engine is running. This is not the case. The cross section of material in the tang is not strong enough to withstand today's open spring loads of 1000 pounds or more! The sole purpose of the tang is to temporarily locate the lock, retainer, and spring relative to the valve until the taper of the retainer can nest around