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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.
Take the number 3 main bearing, known as the thrust bearing, and a flat surface and sandpaper and sand a small amount then recheck until you get the results you want usually between .004-.008 anything over that you may want new bearings.