Hemi valve spring shim. Having a nice selection of valve spring shims makes assembling cylinder heads a much easier task to get the proper installed spring height or if after several runs your valve springs start to lose pressure you can bring them back up with some shims.
Please specify cylinder head type and spring dia. when ordering. Valve spring shim O.D. is 1.625" with a .625" I.D.
Racer can choose shim size from drop down menu. Shims are sold each.