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The COMP Cams seat spacer is offered to avoid stacking .300" of shims beneath valve springs on Big Block Chevrolet engines. It provides a stepped spacer with a 1.732" outer diameter intended for use with 1.568" outer diameter springs, simplifying spring installation by replacing excessive shim stacks and maintaining proper spring spacing without extensive rework.
COMP Cams Rotator Eliminator CB Exh
