it's here in George's chart. George has said in the past that the Pantera engines were sourced from the Mustang assy lines, whatever engine the Mustang 351C-4V was getting for a particular production model year is what the Pantera got give or take for engines on hand in the queue. short story, 1970-1971.5 engine assy dates were 2 bolt blocks and from 1971.5 to the end of production were 4 bolt blocks
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