VIN and Body Plate Decoding
Vin for 1973 Hurst Olds must begin with 3G37U3M (L75 option) or 3G37V3M (L77 option). The 3 identifies the General Motors Division (Oldsmobile), G37 (Cutlass S), U identifies 455 engine (L75), V identifies 455 engine (L77), the next digit 3 indicates (1973), and M identifies the production plant (Lansing). All 1973 HOs were manufactured in the Lansing Michigan plant. The last 6 digits are the sequence number.
Serial Number on the Body Plate for a 1973 Hurst Olds will begin with ST 73 (1973 model year).
3 indicates (Oldsmobile Division), AG37 (Cutlass S), LAN identifies (Lansing, Michigan built), and the last six digits are the production sequence number and will not match the VIN production sequence number. The (TR) trim should be 940 (black) or 947 (white). (PAINT) should be 11 11 (Upper and Lower Body Color White) or 19 19 (Upper and Lower Body Color Black). Next is the build code. The build code consists of two digits and a letter. The first two digits are the month and the letter designates the week of that particular month (05C would be the third week in May). The last two codes are AN7 (Swivel Bucket Seats), and D55 (Front Compartment Console).
The above information was gathered from the book Oldsmobile 442, W-Machines, and Hurst/Olds ID Numbers 1964-91 by Car & Parts Magazine.
From my research here are some guidelines for build codes. At this point these are guidelines and not hard rules. I need more cars to confirm or deny these guidelines. It looks like 1973 HO production started the third week of April at Oldsmobile. That would mean that build code 04C would be the first week of production for the 1973 HOs. This does not include the two proposal cars. The production then continued through the third week of June or 06C. So, the guideline is that 1973 HOs were produced from 4/16/73 through 6/22/73. The two proposal cars would have been built before 4/16/73.
VIN Sequence Numbers
From my research here are some guidelines for VIN sequence numbers. At this point these are guidelines and not hard rules. I need more cars to confirm or deny these guidelines. It looks like 1973 HO production started the third week of April at Oldsmobile. The sequence numbers for this week started somewhere around 385000. I estimate, from research, that HO number 3 is somewhere between sequence number 385000 and sequence number 389000. This does not include the two proposal cars. I am assuming that the proposal cars are HO number 1 and HO number 2. The production then continued through the third week of June and would end somewhere between sequence number 476000 and sequence number 480000. So, the guideline is that 1973 HOs were produced from sequence number 385000 through sequence number 480000. The two proposal cars would have been built before sequence number 385000.
Picture one is Steve Corey's body plate or cowl tag. Picture two is my frame identification number. The frame identification number is located on the frame under the drivers door. Picture three is my engine identification number. The picture is taken from the drivers side of the block, looking through the small gap seperating the alternator and the alternator bracket.
A-Open C-Anti Spin
|ADO or CDO
|AEO or CEO
Below are the part numbers or casting numbers for the 73 HO..