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Chevy cams have a rep to be on the soft side , you might have a cam lobe that has worn off and because of that will sound like a loose tappet , normally they stay quiet with out something going on , if you can take the valve cover off and run the motor the bad lobe, on its rocker arm will not move up and down as much as the others ((( caution ))) oil will spray all over doing this so be advised , you can try to adjust it but the noise wont go away --- if its just loose it will go away but thats almost never -- just what i have seen doing this -- jz
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