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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 thought the 165 used a 1250? Actually I KNOW it does bc I have AFR 165s, but i port matched mine to a 1262.
you can but the problem I had is the gasket ports were close to running off into port, and any shift while installing would interfere with port opening so I have found it easier to use 1262's, either way 1250's are what they recommend