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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.
I have never SEEN a person actually break valves running open headers. Heck I ran open headers for a few months when I was doing the bodywork on my car. All the valves are still working!