NOTE: All numbers and
specifications are as reported in the 1973-1979 Ford
Truck Master Parts Catalog - Oct. 1979.
All engines for 1973-1979 include an
identification tag. This tag describes the C.I.D., model year,
year and month of production, change level number and engine
calibration information. The change level number is advanced
only when a replacing part or assembly being introduced and the
old part or assembly it replaces are not completely
interchangeable. All engine code numbers consist of a basic
number, a suffix and in some cases a prefix. Generally the basic
number is adequate for engine identification, if additional
information is needed the prefix or suffix is included.
These Engine Code Numbers and
their designations are shown in the following chart: