comp cams cam button spacer, steel, roller, for chevrolet, big block, each

Because all roller cam lobes are ground flat instead of tapered, like hydraulic or solid cams, COMP Cams provides a means of holding the cam back to the rear of the engine. Their cam buttons ride between the front of the timing gear and the back of the front cover and can be shimmed for proper endplay of the cam. COMP Cams makes solid nylon buttons and roller bearing thrust buttons for the ultimate in performance.