COMP CAMS ID Locators - 1.660"/.570" ID/.060" Thik COM4669-1

The older style standard shims will not hold up to the extreme spring pressures and high RPM found in racing engines being built today. COMP Cams offers a simple but effective solution to this problem &minus a thin, hardened Steel alloy seat which will not only protect the head and shim but also locate and hold the spring in place.