Comp Cams Nylon Thrust Button for SB Chevy .810" length. Roller cam lobes are ground flat rather than tapered like a flat tappet cam it is necessary to provide some means of holding the cam back to the rear of the engine. The thrust button rides between the front of the timing gear and the back of the front cover and can be shimmed for proper end play of the cam. Use the roller thrust bearing for the ultimate in performance.
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