W-30, L89,Z28,F41,etc.

Is there any method or organization to these codes? Back when I was turning wrenches at the Buick/Cadillac dealership, J codes referee to brakes. F codes relate to suspension, Olds used W codes for performance stuff, Chevy used Z for a lot of their performance items, I could go on. I’m guessing most of us in readerland have their personal favorites.

Some of the codes have a second letter, any significance (Zl1 was the first to pop into my head, FE1 is another). I’m just curious is their was any significance to the selection of the letters. Or just random until they ran out of letters to use?

 

I suspect they may have been for categories on a new car order form. They may have repeated year after year, or changed in subsequent years. J-2 was 1957-58 three two barrel carburetion. W-1 valve covers were dimpled to clear the adjuster screws for solid lifter cams used in a J-2 for racing.
1968 Hurst/Olds was a W-45.....air conditioned was a W-46. 1970, W-45 was a Ralley 350.

 

You are correct in that OEMs had a method in the option nomenclature, I've never studied it enough to become familiar however. One common error the general public makes regarding performance Corvettes is calling a Z06 a "Zee Oh Six". The 0 is a number not a letter. Zora Arkus Duntov spoke of the performance option as "Zee Ott Six". As in the way we call a 30-06 rifle a "Thirty Ott Six".

tc

 

aught!

 

There is absolutely a reason to the RPO codes. Each letter group covers specific elements of the vehicle. These are only a few selected examples.

A codes are typically interior related (A01 tinted windows, A31 power windows, A39 deluxe seat belts, A41 power seat, A51 bucket seats, etc)
F codes are chassis and suspension (F35 HD frame, FE2 suspension)
L codes are engines
M codes are transmissions
N codes are wheel and steering
U codes are electronics (sound system and instrumentation)

Oldsmobile used W for special performance options. Chevy used Z (thus Z06, Z28, etc)

 

Yes...I aught to have known that.

 

[QUOTE=joe_padavano;1329320]There is absolutely a reason to the RPO codes. Each letter group covers specific elements of the vehicle. These are only a few selected examples.

A codes are typically interior related (A01 tinted windows, A31 power windows, A39 deluxe seat belts, A41 power seat, A51 bucket seats, etc)
F codes are chassis and suspension (F35 HD frame, FE2 suspension)
L codes are engines
M codes are transmissions
N codes are wheel and steering
U codes are electronics (sound system and instrumentation)

Oldsmobile used W for special performance options. Chevy used Z (thus Z06, Z28, etc)[/QUOTE

So did each manufacturer have a letter code for performance options? I’m not familiar with Pontiac or Buick engine codes.

I figured the was some format the OEM followed.