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Dauntless Swap Out

Discussion in 'Early CJ5 and CJ6 Tech' started by Randy Benedict, Apr 25, 2020.

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  1. Apr 25, 2020
    Randy Benedict

    Randy Benedict Member

    Center, MO
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    I have a 69 cj5 with the 225 and with a crack in the block. I have a fully built complete 231 from a 79-80 Buick century. It has a thick dauntless flywheel and was mounted to a T90. What is needed to get this 231 into the 69 with the T14? Thanks for any help.
     
    Randy Benedict, Apr 25, 2020
    #1
  2. Apr 25, 2020
    Twin2

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    a pilot bushing in crank
     
    Twin2, Apr 25, 2020
    #2
  3. Apr 25, 2020
    Randy Benedict

    Randy Benedict Member

    Center, MO
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    What about exhaust manifolds?. Will the 225 ones just bolt right up, or will I need 231 manifolds? Don't want headers.
     
    Randy Benedict, Apr 25, 2020
    #3
  4. Apr 25, 2020
    Twin2

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    yep
     
    Twin2, Apr 25, 2020
    #4
  5. Apr 25, 2020
    Lockman

    Lockman OK.....Now I Get It . 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    Ron, are you Sure ? The valve cover's don't ?
     
    Lockman, Apr 25, 2020
    #5
  6. Apr 25, 2020
    3b a runnin

    3b a runnin Active Member 2023 Sponsor 2022 Sponsor

    virginia
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    I think the T14 has a 10 spline output shaft instead of the 6 spline on the T90. Just need a tcase input gear that matches.
     
    3b a runnin, Apr 25, 2020
    #6
  7. Apr 25, 2020
    Twin2

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    everyone has been borrowing the drivers side 231 exhaust . for steering change over
     
    Twin2, Apr 25, 2020
    #7
  8. Apr 25, 2020
    Randy Benedict

    Randy Benedict Member

    Center, MO
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    Just clarifying, I have a bad 225 and want to know if a 79 231 from a Century will be a direct boltup to the heads while keeping the 225 manifolds as they are now. Just wondering about the exhaust, I understand all the other differences. Thanks
     
    Randy Benedict, Apr 25, 2020
    #8
  9. Apr 25, 2020
    cj3may

    cj3may New Member

    latobe pa
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    I have 1978 manifolds bolted to my 1971 odd fire . So I would say yes . If thats what you are asking . They bolt up and the ports lined up . I did grind them to match better.
     
    cj3may, Apr 25, 2020
    #9
  10. Apr 25, 2020
    Rich M.

    Rich M. Shoe salesman 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Maryland
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    Yes direct bolt up.
     
    Rich M., Apr 25, 2020
    #10
  11. Apr 25, 2020
    Lockman

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    I think Valve covers would swap too, then ?
     
    Lockman, Apr 25, 2020
    #11
  12. Apr 25, 2020
    cj3may

    cj3may New Member

    latobe pa
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    Valve cover from the 1978 231 will fit but you have to elongate gate 2 of the holes . That said they don’t have the top flat looking like the 225 valve covers. To me it just didn’t look right.
     
    cj3may, Apr 25, 2020
    #12
  13. Apr 25, 2020
    Lockman

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    Yeah..... the 231's are not " Flathead's"
     
    Lockman, Apr 25, 2020
    #13
  14. Apr 25, 2020
    Randy Benedict

    Randy Benedict Member

    Center, MO
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    I guess my real question is, will I have to modify my exhaust crossover because the angle of the head exhaust mounting face, or are they the same. Thanks
     
    Randy Benedict, Apr 25, 2020
    #14
  15. Apr 25, 2020
    cj3may

    cj3may New Member

    latobe pa
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    I believe that that heads are the same angle and in the same spot. They just made the valve covers different. To the best of my knowledge.i would check but I no longer have the 231 motor.
     
    cj3may, Apr 25, 2020
    #15
  16. Apr 25, 2020
    Rich M.

    Rich M. Shoe salesman 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    Nope
     
    Rich M., Apr 25, 2020
    #16
  17. Apr 25, 2020
    Jeepsterjim

    Jeepsterjim Member

    Lincoln, CA
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    I see a lot yes the exhaust manifolds are the same between a OF225 and the EF 231 I will differ with the rest. IMHO, they are slightly different and will leak if mixed. The OF231 I believe would work.
     
    Jeepsterjim, Apr 25, 2020
    #17
  18. Apr 25, 2020
    torque

    torque New Member

    Iowa
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    Wouldn't the flywheel be wrong? odd fire 225, 79-80 Buick even fire.
     
    torque, Apr 25, 2020
    #18
  19. Apr 25, 2020
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
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    I don't remember when the openings changed on the 231 - sometime in that time frame if memory serves. You can usually tell as they are taller than the 225s. MOST of the time I have gotten away with putting the proper exhaust gasket on - only a couple times I couldn't get them to work. This applied to both putting a 231 in place of a 225, and using 231 exhaust manifolds on 225s. I will say that 99% of the time they mix and match just fine.
     
    Warloch, Apr 25, 2020
    #19
  20. Apr 25, 2020
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
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    Not if the 225 flywheel has a 'neutral' balance on it - to go from the T90 to T14 you need to swap the clutch disk and TO bearing for that to mate properly.
     
    Warloch, Apr 25, 2020
    #20
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