Their are various numbers identifying your car, body, and engine.
Here is an example of them. Engine Serial Number (VIN) Number Shop Manual Name Description/Location(s)
64M001791 Engine Serial Number This is the VIN #, Front Frame Cross Member, on Engine – lower/left by oilpan, Service Notice Plate-driver door jamb Information
1964 60 Special, 1791st 1964 Cadillac Produced of any type out of 165,959 total produced for 1964.
For more information and pictures about VIN #'s click on VIN #'s and Body Styles. Picture
 Body Production Number Number Shop Manual Name Description/Location(s)
323 Body Number Body Name Plate at top of cowl left side top Information
323rd Fleetwood 60 Special Body produced for 1964 out of 14,550 60 Specials produced for 1964. Picture of Body Name Plate
ENGINE UNIT NUMBER
Number Shop Manual Name Description/Location(s)
44K2076 Engine Unit Number Top Rear of Engine by Oil Pressure sending unit, etched into block. Information
44K is the Engine Unit # prefix that identifies that engine type. For this example it means this engine was intended for a 6039, 6329, 6339, 6357, 6367, 6267 with air. 2076 denotes the numerical order in which this engine was buy for that type. A decode card for Prefix codes is located on page 1-2 of the 1963 and 1964 shop manuals.
Decode Info for 1963 390 Engines | Body Styles | Engine Unit No. Prefix | | 6039, 6229, 6257, 6267, 6239, 6329,
6339, 6357, 6367, 6389 with air cond | 36X | 6039, 6229, 6257, 6267, 6239, 6329,
6339, 6357, 6367, 6389 with air cond | 36K | | 6723, 6733, 6890 without air | 37X | | 6723, 6733, 6890 with air | 37K | Decode Info for 1964 429 Engines | Body Styles | Engine Unit No. Prefix | | 6039, 6329, 6339, 6357, 6367, 6267 without
air | 44X | 6039, 6329, 6339, 6357, 6367, 6267 with air
cond. | 44K | | 6229, 6257, 6239 without air | 46X | | 6229, 6257, 6239 with air | 46K | | 6723, 6733, 6890 without air | 47X | | 6723, 6733, 6890 with air | 47K | Picture
Hope this helps. Jason Edge
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