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hmmm, possibly your hydraulic lifters are causing the tapping sound... best way to see if its that is to pop off the valve cover and if you don't have rocker arm stoppers press down on each rocker arm(the part that's sitting on top of each of your lifters) feel for movement like a springy feel, if you feel movement then it means air got into it and needs to be bled. Try that and post back if that's the problem.
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