I am a member of another forum and saw a guy with a 440 & hyd roller cam have his engine ruined because the cam walked. He used a bronze drive gear and one of those cam buttons that was two-piece with a little bearing in between (he got it from Manini but 440 Source looks to sell them too). He said he installed it with .005 clearance between the button and the timing cover. The failed cam button made an impression on the inside of the timing cover. When he took the cover off he saw the...
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