Spring Shim Kit: 1.300: O.D., .520" I.D.
This kit includes 16 each (48 total) of size .015", .030" and .060" shims with 1.350" outside diameter and .520" inside diameter to equalize the installed height of valve springs in GM LS engines. Made from the highest quality shim stock, these shims are heat treated to stand up to radical cam lobes.