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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.
Get a Mr. Gastket 180 and you won't have to worry about the stat for a long long time. 160 is too cold and will cause you to run richer all the time cuz it probably won't reach closed loop temp.