I would check the rocker shaft stand I'll bet the stand has to much up and down play in it and the shaft has a chance to flex up and down in the stand maybe the stands hole were the shaft fits is tappered "larger on the end that the shaft sticks out or long end" so as the rockers open and close the valves the shaft is being bent up and down against the bolt going thru the stand.Thats what it looks like to Me.
Pete
Last edited by Pete52; 09/15/2011 8:40 PM.
