The crank gear may float some on the key and crank snout some in some cases (stock stuff) It will follow the cam. Were talking a movement of very little hear, but will move. How does the alignment look as far as the cam gear and crank gear is concerned? It usually wont go much farther back than the cam gear is, and most flat tappet cams will walk a hair, but mostly the spinning of the tappet will push the cam towards the back of the block, and the face of the block and back of the cam gear crown will provide the thrust and wear.
Is this a stock crank or after market? I guess a aftermarket crank could be machined wrong. Has this crank been used prior?
