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Technical Quadrajet 700R4 Combo.

Discussion in 'The Hokey Ass Message Board' started by PunkAssGearhead88, Feb 6, 2018.

  1. Surprisingly I didn't have much luck searching.

    What year and models of Chevys came from the factory with a 700R4 and Q-Jet?
    I'm guessing early '80s?

    I would like to find a Q-Jet with the correct throttle shaft, TV cable and brackets for a carb conversion I would like to do. Knowing what cars to look for at boneyard would make my search easier. I much prefer to run what GM intended over the aftermarket stuff.
     
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  2. bedwards
    Joined: Mar 25, 2015
    Posts: 241

    bedwards
    Member

    my 85 has it factory stock
     
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  3. I think my son bought a Q-jet for an 85 Monza 262 cu in. for his [my old] 292/700R4. Not sure what the TV cable and bracket is. 68chevypu.jpg
     
  4. Your '85 what?
     
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  5. Thanks, never thought about a Monza. A V8 Monza is not easy to come across these days, although I don't think any of them came with a 700R4 anyway?
     
  6. Fordors
    Joined: Sep 22, 2016
    Posts: 2,452

    Fordors
    Member

    My 1982 GMC Jimmy ( like a Blazer) with a 305 had it.
     
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  7. 75-76 Monza 262
     
  8. That would be a CCC (feedback) carb, correct?
     
  9. bedwards
    Joined: Mar 25, 2015
    Posts: 241

    bedwards
    Member

    Sorry, my 85 C10 w 305 v8 had it stock. Guess I wasn't thinking. That's one of the last years with a carb I think. Its not a feedback carb.
     
    Last edited: Feb 6, 2018
    PunkAssGearhead88 likes this.
  10. Coulda been, Mark. My brother had a 79 monza with a 262...don't know what trans/carb
     
  11. Rocky, 79's were 305 2bbls , stock.
     
  12. hdman6465
    Joined: Jul 5, 2009
    Posts: 648

    hdman6465
    ALLIANCE MEMBER

    I usually use everything from 1984 Chev pickup truck, never had a problem
     
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  13. First of all ,the 700r4 came out in '82. CCC came out in '81, and '80 in Ca., I believe. (pass. cars)
    Light trucks too, I think. Heavy trucks didn't use the 700, so you might be looking for a long time, my friend.
     
    gimpyshotrods likes this.
  14. Another possibility would be a Q-jet from a 67 Pontiac firebird/tempest with the OHC 6 banger. They're only 230 cu in so it may require a little jetting adjustment.
     
  15. No worries, figured you forgot.
     
  16. Thankfully I'm not in too big of a hurry. Seems like '82-'85 are going to be my target years.
     
  17. miker98038
    Joined: Jan 24, 2011
    Posts: 432

    miker98038
    ALLIANCE MEMBER

    IIRC, and at my age and all this time it’s dubious, when I put the 700 in my 79 vette, I just used the proper cable bracket bolted to the rear carb studs, and the factory cable, set per factory manual. I don’t recall mounting a bracket to the carb linkage, I think I used the stud for the 350 turbo kick down. But it’s been over 30 years.
     
  18. Okay then. Let's give the man the part number off your carb. You probably know this, but the number is vertical, behind the secondary linkage, driver's side.
     
  19. Fordors
    Joined: Sep 22, 2016
    Posts: 2,452

    Fordors
    Member

    Mark, too many years and too many vehicles, I honestly don’t remember for sure but it seems like the Quadrajet was not CCC.
    The ‘82 Jimmy’s were a bit unique, the convertor lock up function was not controlled by the ECM, there was a vacuum switch on the firewall wired to a pressure switch screwed into the trans case IIRC.
     
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  20. David Gersic
    Joined: Feb 15, 2015
    Posts: 2,063

    David Gersic
    Member
    from DeKalb, IL

    If you do that, it may work, but the shift points may be wonky.



    Sent from my iPad using The H.A.M.B. mobile app
     
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  21. sunbeam
    Joined: Oct 22, 2010
    Posts: 4,539

    sunbeam
    Member

    1985 Astro with a 4.3 V6 ran Qjets.
     
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  22. Yes , it looks like the trucks could come either way. Come to think about it, I had an 85 C10 ,non CCC , but T350 C.
    I put a 700 in it, and just hooked the TV cable to where the kickdown was. It worked okay.
    Here I go again, but most trucks came with the 800 (1.21 venturi) carb, if that's what the o/p is looking for.
    Might want to look up towards Canada too.
     
  23. Yes, they were the 800's also, strangely enough.
     
  24. An 800 would be nice, however, a 750 is plenty for what I need. I would prefer to run an older Q-Jet, so all I really need is the throttle shaft from the newer carb. I'm paranoid about the line pressure being correct throughout all throttle positions. I'm surprised hooking the TV cable to where a kickdown cable would normally go worked OK for you, I would imagine the geometry is similar then.

    Yes, that is very strange and interesting at the same time.
     
  25. sdluck
    Joined: Sep 19, 2006
    Posts: 2,274

    sdluck
    Member

    The sell linkages for 700 r4 for both edelbrock and holley to set the correct geometry.No hooking the 700 cable to the 350 cable is not correct. One is a kickdown (350) one is throttle pressure (700). Not to many used carbs.
     
  26. Now that you mention it, I bought the Bow Tie kit for my 85 truck. Did have to keep screwing with it until it was right.
    Not a perfect fit for all apps. That's why there's an adjuster on it.
    I was thinking of some of my 200 4r deals where I used the early carbs and the 350 peg. All non- factory combos are different and need tinkering with. The important thing is to put a pressure gauge on it and check it.
    I don't think you can use a CCC base plate on a std. carb. You can change the primary shaft, but again, it might need tweaking when all said and done.
     
  27. Jalopy Joker
    Joined: Sep 3, 2006
    Posts: 24,154

    Jalopy Joker
    Member

  28. My 1985 Chevy C-10 Suburban has a 350, Qjet, and a 700R4 stock. No CCC, just a vacuum switch to unlock the converter.


    Sent from my iPhone using H.A.M.B.
     
  29. If you can decipher what this pic is showing you, then check out this guys pages.
    http://purplesagetradingpost.com/sumner/techinfo/700R4p1.html
    image.jpeg

    Then there's a valve body that's more forgiving to TV cable that's out of adjustment.
    https://www.summitracing.com/search...i-constant-pressure-valve-bodies?N=4294945321

    Quadrajet is a fine carb, one of the most versatile and tunable.
    But unless you speak fluent quadrajet they are Hard to get your head around, find tuning parts for, complicated to rebuild. If you need to have one for what ever reason, there's nothing else that will do.

    However This is a fantastic carb-
    https://www.holley.com/products/fuel_systems/carburetors/demon/street_demon/parts/1900
     
  30. My '84 Caprice wagon did and any GM wagon with the 305 should have that combo.
     
    PunkAssGearhead88 likes this.

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