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The thrust button on the end of the cam is used to keep the cam from walking—moving fore and aft in its journals. Excessive cam movement can change the distributor timing and rob your engine of power. A dial indicator at the rear cam bearing measures the amount of endplay after test-fitting the cam button and timing cover.
396ci Chevy Big Block - Engine-Building Tips

 The thrust button on the end of the cam is used to keep the cam from walking—moving fore and aft in its journals. Excessive cam movement can change the distributor timing and rob your engine of power. A dial indicator at the rear cam bearing measures the amount of endplay after test-fitting the cam button and timing cover.  View Related Article

 

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