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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.
Usually the best way to tell if ifs the head gasket it by checking your oil. If it looks like chocolate milk then its the head gasket. If yours looks fine then I am not exactly sure what it is but definately heck the compression.