VIN and Engine Code confusion

Discussion in 'The "Paper Trail"' started by theitalianflip, Jul 30, 2018.

  1. theitalianflip

    theitalianflip 71 Buick GS

    I keep getting different information on some of this engine/VIN decoding stuff, and it's getting confusing.
    Basically, I want to verify that:

    1. My 71 is a real GS (43437 says it is)
    2. It has the original engine (serial code on block matches the VIN).
    3. What does the engine code mean? I read somewhere that this code means it had a 2bbl?
    4. Why doesn't the Serial Number on the body tag not match the VIN?

    Any help will be greatly appreciated and help me sleep at night.

    VIN: 434371Z122834
    Body Tag: 71-43437 Z 01375
    Engine Code: D/230?
    Engine Serial: 171Z122834?
     

    Attached Files:

    Last edited: Jul 30, 2018
  2. flynbuick

    flynbuick Guest

    4 = Buick

    34 = GS (can be GS350 or GS 455)

    37 = 2 door coupe

    1 = 1971 model

    Z = Fremont California plant
     
  3. flynbuick

    flynbuick Guest

    67 = Burnished cinnamon body paint

    F = dark brown vinyl top (confirm this)
     
  4. thepartsman

    thepartsman Back Ordered Again ?

    D = '71 350-4bbl 260hp.
    230 = Assembly Date Code
    Engine serial number matches your VIN except for the "7" ?
    The 1st number if you look closer is a "4"
    4 = Buick
    7 = ?
    1 = 1971
    and the rest you know already.....plus what Jim posted.
     
  5. theitalianflip

    theitalianflip 71 Buick GS

    You guys are amazing, thanks a bunch, all of you!
     
  6. theitalianflip

    theitalianflip 71 Buick GS

    I thought the "7" was a "Z" and matches the Z as the location of the build?
     
  7. theitalianflip

    theitalianflip 71 Buick GS

    Just a little fun fact, I live in Newark, it's surrounded by the city of Fremont.
    I drive by the factory all the time (now Tesla), it's nice to bring the car back home where it was born.
     
  8. buick64203

    buick64203 Just plum crazy Staff Member

    Where are you getting "SD" from?. In 71, the engine code for a 350 4 bbl should be TB, not SD

    Here is the engine code location of my Framingham built 71 455. Notice the TR. Ive seen the codes partially obscured by the head gasket

    KIMG1581[1].JPG
     
  9. theitalianflip

    theitalianflip 71 Buick GS

    And this is why I'm confused.
    BTW, look at the picture I provided, it does say D/230 from what I can see.
     
  10. thepartsman

    thepartsman Back Ordered Again ?

    I don't see where the mention of "SD" is in any post. There is not an SD in '71. The S would represent 1970 and there is not a code D in '70.
    D = in 1971 the code for a 350-4bbl with 260hp.
    B = in 1971 is the code for a 350-4bbl also with 260hp
    Either was used according to Buick so your stamping code would either "TB" or "TD" and of course the "T" = 1971
    In January of 1970 Buick stated that "TD" was used in Skylarks,Sportwagons, LeSabres and GS models. In Sept. of 1970
    Buick stated that "TD" was LeSabre only.
    His VIN matches the stamping so if my old eyes are correct it's a match.
     
  11. buick64203

    buick64203 Just plum crazy Staff Member

    It wasn't mentioned, but one of the pictures referenced it
     
  12. thepartsman

    thepartsman Back Ordered Again ?

    The pic referenced a "D" it looks like he has not scraped enough to find the "T".
    I do not see any reference of an "S" code in any post.
     
  13. theitalianflip

    theitalianflip 71 Buick GS

    Do you think it's necessary to try and find the S, or is it safe to assume that D/230 is correct for 4bbl 350-260hp?
     
  14. theitalianflip

    theitalianflip 71 Buick GS

    Also, what is the last 3 numbers of the Body tag mean? Should it be in the VIN?
    7-30-2018 2-48-25 PM.jpg
     
  15. thepartsman

    thepartsman Back Ordered Again ?

    Sir, your car has been identified as a 1971. Your VIN in 2 locations says it's a '71. If you scrape you will or will not find the "T". BUT you will not find an "S".
    There is no assume its a 350-4bbl. In 1971 the "D" = 350-4bbl 260hp.
    There is not a "D" code in 1970.
    The complete stamp code would read "T D" = a 1971 350-4bbl 260hp.
    Other than this I do not know what else to tell you.
     
  16. theitalianflip

    theitalianflip 71 Buick GS

    Hey, that's more than I knew earlier today.
     
  17. buick64203

    buick64203 Just plum crazy Staff Member

    The OP posted this pic in the first post-

    7-30-2018 10-06-17 AM.jpg

    He seemed to indicate he thought this was the engine code, but I may have misread that.

    No, that is the Fisher body number.
     
    theitalianflip and thepartsman like this.
  18. thepartsman

    thepartsman Back Ordered Again ?

    Jason, I see what your talking about now. Like I said, these old eyes missed that.
    Something tells me this car is not 49 state local. Body Style "SD"....are they calling
    this 2dr coupe a sedan?....
     
  19. theitalianflip

    theitalianflip 71 Buick GS

    I actually took a good look at the engine code, and it looks like there is a T all the way to the left. It’s hard to see, but I do think it is T D/230.
     
    thepartsman likes this.
  20. thepartsman

    thepartsman Back Ordered Again ?

    Just to add what Jim has already posted,

    What your Fisher Plate says, hope this helps.

    71 = 1971
    4 = Buick
    34 = GS ( 3400 Series )
    37 = 2dr H.T.
    Z = Fremont Assembly Plant
    01375 = Fisher Body Build Sequence Number
    156 = Sandalwood Vinyl Notchback Interior
    B80 = RPO Code for Drip Rail Moldings
    67 = Burnished Cinnamon Lower Exterior Body Color
    F = Dark Brown Vinyl Top
    04A = Assembly Time Code 04 = April, A = 1st Week 1971
    The other 2 sets of numbers are Data Processing Numbers
    Used internally at Fremont.
     

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