73-77 Floor pan interchange for Century?

Discussion in 'Chassis restoration' started by SKN350GS, Feb 3, 2021.

  1. SKN350GS

    SKN350GS Active Member

    Hey Guys,
    In pulling the interior on my recently acquired '73 GS, I found some heavy rust in the lowest points of the front footwells that seems to be too pitted to grind down so patches are probably in order. The affected areas are like 8" x 8" max so these will be patches rather than full floor sections. I have checked all the usual sheetmetal vendors and no one can tell me if the front floor patches interchange between the usually listed models (Chevelle/Laguna/Malibu/Monte Carlo, Cutlass) and the Century. I am prrrrreeety sure they should interchange but I wanted to see if anyone has been down this path already on the colonnade era Buicks to know for certain. Thanks!
     
  2. nekkidhillbilly

    nekkidhillbilly jeffreyrigged youtube channel owner

    the share frames and glass so they should ive not been down this path but idk why it wouldnt be atleast super close.
     
  3. MNBelv57

    MNBelv57 Well-Known Member

    Some years ago I used patch panels from a Monte Carlo for my 74' gran sport. I think I got them from NPD. But a couple years ago I got ones specificaly made for my 75' Regal. They were nice replacements. Summit sells them and they should be the same for your car.
     
  4. sean Buick 76

    sean Buick 76 Buick Nut

    73-77 Cutlass, Chevelle, Malibu, lemans, gto, etc
     
  5. 1973gs

    1973gs Well-Known Member

    I used the 73-77 Chevelle front floor panels in my 73 Buick. No difference.
     
  6. SKN350GS

    SKN350GS Active Member

    so it begins. pulled up the carpet to find this. looks like water pooled on the inside from a leaking window seal. IMG_0092.JPG
     
  7. SKN350GS

    SKN350GS Active Member

  8. SKN350GS

    SKN350GS Active Member

    Out with the old


    5D805E76-3540-495E-B6E2-FCC4092CDFAD.jpeg
     
  9. SKN350GS

    SKN350GS Active Member

    Ended up cutting more that the photo above to get to clean metal and finesse out the spot welds connecting the toe board area to the underlying body
    Mount box/bulkhead.
     
  10. SKN350GS

    SKN350GS Active Member

    But after a lot of trimming, bending, and general sheet metal coercion....

    5D961199-694F-45AF-B832-99134484099C.jpeg
     
    berigan likes this.
  11. alvareracing

    alvareracing Platinum Level Contributor

    so, what pieces worked and who had them? Nice work BTW !

    Fernando
     
  12. SKN350GS

    SKN350GS Active Member

    They were from OPGI. Took a bit of tweaking to get everything fitted up but I’m happy with the result
     
  13. alvareracing

    alvareracing Platinum Level Contributor

    from a Chevelle or made generic for all 73 -75 A-body? Any information provided can help those that need to do the same thing!
    thanks
    Fernando
     
  14. SKN350GS

    SKN350GS Active Member

    The catalog had them listed under Monte Carlo but I think all the A body front floors/toe boards are all the same (as mentioned by others earlier in this thread) with all the 3D curvature, I don’t think a job like this is ever plug and play- there will be a lot of fit up and trial and error to sneak up on the right fit
     
    alvareracing likes this.
  15. 1973gs

    1973gs Well-Known Member

    Hope that it's not too late, but make sure that there aren't any leaks before you reinstall the carpet. On my car, two of the three vent inlets located in the cowl had no sealer.
     

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