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225 Dauntless Heads On 231 Block

Discussion in 'Early CJ5 and CJ6 Tech' started by Richard Andrews, Mar 23, 2023.

  1. Mar 23, 2023
    Richard Andrews

    Richard Andrews New Member

    grand junction, co
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    Mar 21, 2023
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    Are 1967 V6 Dauntless heads compatable with a 1979 buick 231 block? Thats what came with my 67 cj5, but they were not together. It also came with a Dauntless intake but I'm sure that wasn't on there before the prior owner tore the engine apart. Trying to figure what will work together or not. Thanks
     
  2. Mar 23, 2023
    Fireball

    Fireball Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Pullman, WA
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  3. Mar 23, 2023
    Richard Andrews

    Richard Andrews New Member

    grand junction, co
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    Mar 21, 2023
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    I read the thread you mentioned, that clears that delima up. The 225 heads were rebuilt in Denver in 12-22 so I think I'll sell those and source heads for the 231 1979 Buick. I need an intake manidold for that year also, something I can put a mechanical 2/4 brl on. Just to keep it simple. That seem right to you? I really appreciate your knowledge, first Jeep, first V6 so I am kinda walking around blind.
     
  4. Mar 23, 2023
    Fireball

    Fireball Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Pullman, WA
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    Yes, that's a good plan. Any 231 heads/intake from 1975 to somewhere in the early 80's (I'm not sure the cutoff) should work.
     
  5. Mar 23, 2023
    Rich M.

    Rich M. Shoe salesman 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Maryland
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    There's some nuances with the odd fire 231 (75-77) and first year (78) even fire heads/ intake. If you are certain your block is 79 I'd shop for 79 and later. The large bore 2gc carb was dropped after 78 and the intakes are patterned for the 2mc/ dualjet carb after.
    Being an evenfire you may want to consider an Edelbrock/ aluminum intake which will be tapped for multiple carb patterns and allow you to use a 2bbl, 4bbl or convert to tbi.
     
    vtxtasy and Fireball like this.
  6. Mar 27, 2023
    beninboston

    beninboston New Member

    Falmouth, Maine
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    Sep 26, 2012
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    I've got heads for a 231 available (already been to the machine shop) if you need them. I had a 225 that had 231 heads and the shop didn't realize it until they were refinished. Ended up finding more issues with the 225 block and found a new core to rebuild. 231 heads are in my garage. Casting # is 1249175.

    Original post: http://earlycj5.com/xf_cj5/index.php?threads/148036/#post-1670432
     
  7. Mar 28, 2023
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
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    If your learning and possibly mix-matching these motors, get Pat Ganahl's V6 Book. It will point you in the right direction and clear all the little things up for you we may forget. Folks think the 231 and 225 are the same, but they are not. Can swap them out for each other, but internals and lots of little parts different - even the water pump cover changes how and where your timing goes.
     
  8. Apr 2, 2023
    Richard Andrews

    Richard Andrews New Member

    grand junction, co
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    You know I think I will read Ganahl's book. Knowledge is key. I found some bare heads ready for rebuild that matches my 79 231 block. I also took the intake manifold advice and I think I will go with the Edlebrock #5486 . It seems to be what I am looking for. Maybe put a small cfm (500 ?) 4 blr carb with a manual choke and a RV cam and call it simplified and functional. Think that works? Thanks for your replies.
     
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  9. Apr 4, 2023
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
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    I had trouble with an Edelbrock 500cfm carb, but I got the Holley TA470 to work fine. I would build 390s before that to try to incorporate much of what came in the TA470. Since then, I've moved to EFI. The Summit unit is what I'm putting on the '63 build with a 231 and what my neighbor is running on his 225... but then he is buying the '63 from me as it is.

    Would have to double check, but I believe the Edelbrock 5486 is what is on the 231 in the build as well.
     
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  10. Apr 5, 2023
    vtxtasy

    vtxtasy oldbee 2024 Sponsor 2023 Sponsor

    Tucson, AZ
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    The Summit unit is a non-progessive 4-barrel EFI. This kinda defeats the purpose of a dual-port intake manifold. Then again, any
    EFI would be the same. Opening all 4-barrels on a little engine seems wrong. Summit looks to be a Holley clone. I am curious as to
    how well it runs and does it use a trigger.
     
    Last edited: Apr 5, 2023
  11. Apr 5, 2023
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
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    In the end - air fuel flow is air fuel flow. Since these units utilize a closed loop and self program, the impacts of the various flows seem to even out fine. These use just a HEI signal and seem to work fine with it. You may get a bit more out of using a trigger, but I'm also using the EZ-EFI without one and have not really had any issues on two OF 225s. I've used these with Kenne Bell Number One intakes and the Offy Dual Plane setups. No real difference with them, but I'm not racing with them either.

    Neighbor uses a command module with his, while mine are all plumbed from the tank with inline high pressure pumps.
     
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