COMP Cams Valve Springs, Retainers 4742-100 COMP Cams' Valve Spring Shims are manufactured from the highest quality shim stock available. The shims are heat-treated to withstand radical camshaft lobe profiles, and are a great way to equalize the installed height of valve springs. Spring Shim, EB .030 X 1.250" 4742-100 - Spring Shim, EB .030 X 1.250" COMP Cams Spring Shims Eb .030 X 1.250in