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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.
no not all 5.0 L EFI's were HO. i was looking to make my 4cyl to 5.0 swap cheaper by using a 5.0 from either a crown vic or a grand marquis, but after talking to many local and state mustang performance shops, those engines were not HO and they also weren't equipped with the roller system that all HO's have.