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1. Is it possible you have an exhaust manifold gasket leaking? They will sound like a tappet.
Second item:
2. Start the car and put a long screwdriver to your ear, hold it against the valve cover above a valve, then move to the next valve and listen again. Do this until you have covered all the valves. When you hear some unususal (different from the others) noises, begin your investigation at that location.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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