As I have always understood:
The Ford FE engine was a Ford V8 engine used in vehicles sold in the North American market between 1958 and 1976. A related engine, the Ford FT engine, was used in medium and heavy trucks from 1964 through 1978. The FE filled the need for a medium-displacement engine created by the discontinuation of the Lincoln Y-block V8 engine. The FE joined Ford's other V8s which included a small Y-block and the big block MEL engines.
"FE" is an acronym for 'Ford-Edsel'. The later versions used in trucks were known as "FT", an acronym for 'Ford-Truck'. Another engine family, the MEL, stood for "Mercury-Edsel-Lincoln".
source: Wikipedia
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