Alright, first digit indicates decade;
B=1950-59
C=1960-69
D=1970-79
E=1980-89
F=1990-99
Second digit indicates year of decade;
Third position indicates car line;
A=Ford
D=Falcon
G=Comet, monetego, cyclone
J=Marine & Industrial
M=Murcury
O=Fairlane &Torino
S=Thunderbird
T=Ford Truck
V=Lincoln
W=Cougar
Z=Mustang
Fourth indicates the engineering group;
A=Chassis group
B=Body Group
E=Engine Group
If the item is a servie part, the fourth position then indicates the applicable division;
Z=Ford Division
Y=Lincoln-Mercury
X=Origional FOrd Muscle parts program
M=Ford Motorsports SVO or Ford-Mexico.
FOur digit number indicates the basic part number;
F19E B8
"F" tells you its from 1990-1999
"1" tells you what year in the 90's its from, so its a 91'
Im not sure what the 9 means, you sure its not a letter, it should be a letter...THen the E just tells you its from the Engine department. The BB part just indicates the revision under the part number, like A means its the origional form of the part, B indicates its the first revision, C indicates the third and so on....The first four digits always use that method to decifer them, Such as C9OE or whatever tells you its from the 60's, a 69 to be exact, then O means its out of a Fairlane or Torino and E tells you its from the engine group....Sorry for that long post...Hope that helped you.