1. Registration trouble? Please use the "Contact Us" link at the bottom right corner of the page and your issue will be resolved.
    Dismiss Notice

V6, 231 Carb Suggestions

Discussion in 'Early CJ5 and CJ6 Tech' started by TheeMule, Feb 21, 2021.

  1. Feb 21, 2021
    TheeMule

    TheeMule New Member

    Waverly, Tn.
    Joined:
    Feb 21, 2021
    Messages:
    3
    Barn find a 70 CJ 5, no engine, 3 speed trans.
    Son-n-law gave me a 76 Buick V6 231 out of a Buick Skylark no carb.was running before he sold carb.
    Using Holly's charts it's a 2GC large bore, specs on car said it had a 2 barrel Rochester.
    Has a HEI distributor.
    Which carburetor would you install and why,
    Thank you for your input.
     
    Last edited: Feb 21, 2021
  2. Feb 21, 2021
    Rich M.

    Rich M. Shoe salesman 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Maryland
    Joined:
    Mar 23, 2008
    Messages:
    2,169
    Rochester large bore 2GC was stock and bolts right up, runs well even upside down. Motorcraft 2100/2150 close second, they require an adapter.
     
    TheeMule likes this.
  3. Feb 21, 2021
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
    Joined:
    Aug 10, 2003
    Messages:
    23,596
    TheeMule likes this.
  4. Feb 22, 2021
    Mr Vaughan

    Mr Vaughan

    Welcome!
    does this jeep have the flanged rear axle?
     
  5. Feb 22, 2021
    jeepdaddy2000

    jeepdaddy2000 Active Member

    Eagle Point oregon
    Joined:
    Jun 24, 2004
    Messages:
    1,132
    I agree. The Rochester 2G series (big and small) is an outstanding carb and I have always been surprised it wasn't used more often for carb swaps/upgrades on the likes of the Jeep 323 and 258 sixes, Land cruisers, IH's etc.....
     
  6. Feb 24, 2021
    Oldpappy

    Oldpappy A.C. Fults - Curmudgeon at large 2022 Sponsor

    East Tennessee
    Joined:
    Feb 8, 2021
    Messages:
    1,620
    I waffled back and forth on this for a while.

    The engine I have is a 3.8 (231) out of an 85 Regal so it had the computer controlled version of the Rochester 2G which I can't use in my Jeep.

    I looked hard at installing a Motorcraft 2100 but the only adaptor I could find had bad reviews, so I thought about making my own adaptor, which I have done before. Then I found a "remanufactured" earlier version Rochester listed by an Ebay seller with 100% positive feedback, so I just bit the bullet and bought that, because as said they are real good carburetors and this will bolt right up. Cost including shipping was $196 which seems high for a rebuilt carburetor but a new one is about $300.

    I took a 30 year hiatus from working on cars and prices on stuff like this have gone up a bit, but I have more money than time nowadays and just want to get it done.

    The Motorcraft 2100 carburetors can be had a good bit cheaper, if you want to go with that an an adaptor.
     
  7. Feb 24, 2021
    Mr Vaughan

    Mr Vaughan

    i'm the opposite.
     
  8. Feb 24, 2021
    Oldpappy

    Oldpappy A.C. Fults - Curmudgeon at large 2022 Sponsor

    East Tennessee
    Joined:
    Feb 8, 2021
    Messages:
    1,620
    I was the opposite too for most of my life, but once all the kids grew up and moved away my very frugal wife has greatly improved our financial situation. I just turned 65 and want to get this Jeep up and going while I still have a few more years to enjoy driving it.
     
  9. Feb 24, 2021
    jeepdaddy2000

    jeepdaddy2000 Active Member

    Eagle Point oregon
    Joined:
    Jun 24, 2004
    Messages:
    1,132
    If it is a big bore 2G series, why don't you install an earlier non emission 2G and call it done. That would save a lot of adapting.
     
  10. Feb 25, 2021
    colojeepguy

    colojeepguy Colorado Springs

    At the foot of...
    Joined:
    Apr 4, 2010
    Messages:
    7,110
    Just to eliminate confusion here, an 85 Buick would have a Rochester E2ME carb...essentially, the front half of a Qjet with electronic mixture controls. Completely different from the 2G series carbs.
     
  11. Feb 25, 2021
    Fireball

    Fireball Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Pullman, WA
    Joined:
    Feb 9, 2018
    Messages:
    5,622
    It looks like the E2ME has a different bolt pattern so the original poster would need a manifold or at least an adapter to go with a 2G?
     
  12. Feb 25, 2021
    Oldpappy

    Oldpappy A.C. Fults - Curmudgeon at large 2022 Sponsor

    East Tennessee
    Joined:
    Feb 8, 2021
    Messages:
    1,620
    I didn't mean to hijack the thread, but looks like I may have caused some confusion in this discussion. I apologize for that.

    The OP has a 76 Buick V6 not the 85 I have. The 76 would have a non-computer controlled carburetor, not sure whether it would be the 2G or not.

    My 85 engine has the Computer controlled "DualJet", and I have ordered the earlier (1980) version of this carburetor which looks exactly the same other than not having the plugins for the computer. As said above it looks like the front half of a Q-Jet.
     
    Fireball likes this.
  13. Feb 25, 2021
    colojeepguy

    colojeepguy Colorado Springs

    At the foot of...
    Joined:
    Apr 4, 2010
    Messages:
    7,110
    76 would be the 2G, but the larger base version compared to a stock 225 carb.
    Also, 2G refers to a manual choke carb, 2GC has the thermostatic choke on the carb and 2GV has the choke thermostat mounted to the intake manifold.
     
    Last edited: Feb 25, 2021
New Posts