1987 Pontiac Firebird Repair Question
The tapping may be a noisy valve lifter, you will have to get a cooling system pressure test done to help locate any external coolant leaks, start here.
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I agree about the pressure test, but the tapping if it's not in time (rythm)of the engine and more like a tinny rattle, could be either a heat shield on the conveter or pipes(exhaust), or a heat riser with a broken bi-metalic sprig , it's right at the bottom of the exhaust manifold and the top of the Y pipe.
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