There is a machined pad located on the left front corner of the cylinder block.
On it will be stamped, X M _._L T XXXX XXXXXXXX
where
X = last digit of the model year
M = plant M Mound Road
S Saltillo
T Trenton
K Toluca
_._L = engine displacement
T = usage T truck
XXXX = month/ day
XXXXXXXX = serial code (last 8 digits of VIN No.
Bob
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