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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.
you should gap them between .035-.040 with a gauge, althoughmost plugs from any factory already have them set there, you only need to go bigger when your producing much higher spark for an engine that needs it