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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 have a 86 roller block and a 83 non roller block in my garage. Both of them have it stamped on them. I'm not sure what it means but its on all late model blocks.
I just tried to look it up on google but all it brought up was **** mainly. I guess I'm going to be occupied for a while searching these **** sites for information about it.