COMP Cams Valve Springs, Retainers 4740-100 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 .015 X 1.640" 4740-100 - Spring Shim, EB .015 X 1.640" COMP Cams Spring Shims Eb .015 X 1.640in