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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 did check the reciept. It says 306.. the engine's wrapping and tag say 331. everyone here told me how to find out and all signs point to 331. so it must be a 331. thats not what the reciept says[&:]