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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.
sounds like a rocker....or a bent pushrod. eitherway it sounds like there is some excessive play up top. pull the cover off and grab some feeler guages.