Because today’s racing engines run at higher RPM levels with harsh cam profiles, the tip of the valve stem must withstand a tremendous amount of pounding. These engines always run just on the brink of one of the most severe conditions that exists – valve float. The best solution to this problem is the COMP Cams® Valve Lash Caps. These lash caps are precision machined and ground perfectly flat to maintain accuracy of valve train adjustment. * Ultimate in strength and reliability * Fit valve stems well and are easily removed * Special version for short tipped Chrysler Hemi valves * Necessary for titanium valves PartNumber : cca620-12 Description : Valve Lash Cap; Hardened; 12 Pieces Title : 620-12 Lash Caps, 5/16" California Proposition 65 : WARNING: This product contains a chemical known to the State of California to cause cancer, birth defects or other reproductive harm. Overall Head Height : 0.23 Thickness : 0.08 Valve Stem Diameter : 5/16 Valve Stem Diameter : 5/16" Overall Head Height : .230" Thickness : .080" Engine Components::Valve Lash Caps