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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.
Is it an ARP bolt? What kind of bolt is it? Did you look on the ARP site for the specs? What kind of lubricant are you using? Have these been used before or are they new?