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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
'Clack' or more of a 'tick'. My Smog pump line is broken off inside the engine bay, just before where it would turn to go to the exhaust, and it makes a ticking noise. You could have a leak but who cares ditch the cats and smog pump.