Quadrajet differences between years question
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RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, Quadrajet differences between years question in Past Cadillac Vehicle Discussion; I want to rebuild a Quadrajet for my 1979 deville before I get into putting the EFI I got for ...
  1. #1
    ferrisworld is offline Cadillac Owners Fanatic
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    Quadrajet differences between years question

    I want to rebuild a Quadrajet for my 1979 deville before I get into putting the EFI I got for it on. It has a quadrajet now and I want to learn about the old school stuff before I get into the new stuff. I want to pull one from pick n pull to build so I don't have to disable the car while I build the carb. I have access to a 77 eldorado, and a 75 fleetwood. Obviously the 77 will be the best match, and I read that 76+ castings are the ones people are after. I also read that in 1979, they replaced the plastic limiting caps with steel ones that are hard to remove, so perhaps that would make the 77 carb an even better option?

    Thanks

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  3. #2
    Jeff R's Avatar
    Jeff R is offline Cadillac Owners Fanatic
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    Re: Quadrajet differences between years question

    Good idea getting a junk one to work on. I've done that a couple of times too. No surprises when you start working on the one that counts.
    Jeff

  4. #3
    ferrisworld is offline Cadillac Owners Fanatic
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    Re: Quadrajet differences between years question

    Is it bad if the air flaps have surface rust? Also the secondaries are stuck closed. Should I skip it and look for another?

  5. #4
    rodnok01's Avatar
    rodnok01 is online now Cadillac Owners Connoisseur
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    Re: Quadrajet differences between years question

    Yes and yes... If the secondaries are stuck the bushings on shaft may need replacing. If you just want to take a couple apart fine. To be honest Q Jet's fairly simple to rebuild. I'm sure you can pick a book up on the cheap on rebuilding them.
    Try amazon also
    http://www.ebay.com/itm/ROCHESTER-CA...f6a08b&vxp=mtr

  6. #5
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: Quadrajet differences between years question

    Yeah, that ^^^^

    ........ and when you get Doug Roe's book, study up on secondary metering rods, rod hangers, secondary air valve operation, jet sizing, and primary jet needle operation.

    You can make a full-time hobby of finding QJs and stockpiling internal parts - the possibilities for individual tuning are literally infinite.

  7. #6
    ferrisworld is offline Cadillac Owners Fanatic
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    Re: Quadrajet differences between years question

    I got the book a while ago, so I have that. I'll just keep my eyes out for a better 76-78 carb. The whole car looked like it had been weathered pretty severely. Even the cashier at pick n pull said he wouldn't buy the carb if it was him.

    Thanks guys.

  8. #7
    rodnok01's Avatar
    rodnok01 is online now Cadillac Owners Connoisseur
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    You need to figure out what numbers you can use and look for those. Junk Q jets a dime a dozen back in the day. Think i finally junked all my old carbs last years except for any that were being used. Dont limit your search to cadillacs if you just want to mess around with them.

  9. #8
    ferrisworld is offline Cadillac Owners Fanatic
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    Re: Quadrajet differences between years question

    Well they want $50 for one, and I want to put it in my Cad.

  10. #9
    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: Quadrajet differences between years question

    Lots of Qjets on ebay too. That's where I get most of mine. I have never paid more than $50 for one and I usually can find a clean one for that price.

  11. #10
    Angry Matt's Avatar
    Angry Matt is offline Cadillac Owners Enthusiast
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    Re: Quadrajet differences between years question

    What's the difference with the California model? Is there something to be lost by using this version?

  12. #11
    rodnok01's Avatar
    rodnok01 is online now Cadillac Owners Connoisseur
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    Re: Quadrajet differences between years question

    There are high altitude versions, CA versions(can have additional features and are tuned specifically to pass CA regs) which I avoid like the plague...

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