Although
multiple plants began building engines for Chevrolet in 1967, this letter
code will always remain as one letter. The next two digits designate the engine
assembly month code. If the month code is january through september, the month
code will be preceded with a "0" and still remain a two-digit code. The next
two digits after the month code represent the specific day of the month the
engine was assembled. It will always be a two-digit number as well. The last
two letters of the engine code represent the actual engine code suffix. The
engine code suffix gives the intended specific application for that engine
in the model year that it was built.
Beginning
in the 1960 model year and lasting through the end of the 1975 model year,
the engine assembly plant code was moved to the right hand side of the pad
and any vehicle identification number would be stamped on the left. This included
all small block engines and all passenger car 409 engines.
