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COMP Cams Spring Seats .045 X .520 X .8 - cca4680-16 import_2022_03_21_012537 Mufflers & Tips::Headers & ManifoldsThe 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 a thin, hardened steel alloy seat which will not only protect the head and shim but also locate and hold the spring in place. Previously, this part has been available only in a cup form with the retaining portion being on the outside of the part. This