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The little adjustment spec plate on the valve cover is held on by 2 screws. At least one of the screws is directly over a rocker arm and with a slightly thin valve cover gasket, rocker arms have been known to contact the end of the screw.
Try removing the screws and seeing if the tapping goes away. If that's the case the cure is to put the screws back on then grind off a little from the bottom end of the screws.
Try removing the screws and seeing if the tapping goes away. If that's the case the cure is to put the screws back on then grind off a little from the bottom end of the screws.
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