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77 CJ5 Engine Swap...What V8's do you recommend

Discussion in 'Intermediate CJ-5/6/7/8' started by tommyboys77, Sep 5, 2005.

  1. Sep 5, 2005
    tommyboys77

    tommyboys77 New Member

    Joined:
    Apr 2, 2005
    Messages:
    12
    I have a 77 CJ5 that has an issue with the current 258 engine. I think the cam might be bent or perhaps the bearings are bad. The last time it started it broke the teeth off of the distributor. Anyway thinking of swapping to a 304 or 360. Does anyone have any suggestions? Will it bolt up to the existing transmission? Am aware that engine mounts will have to be moved. Any info would be great. Also I live in cumming, Ga anyone know of any good used motor shops, etc. Thanks, T.
     
  2. Sep 5, 2005
    timgr

    timgr Jeepin' Nerd 2020 Sponsor 2019 Sponsor

    Medford Mass USA
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    Aug 10, 2003
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    20,368
    Which transmission do you have, the T-150 3-speed? All the AMC I6s and V8s after 1970 have the same pattern, so you could use a 304, 360, or 401. You could also build a stroker mtor from a 4.0L and a 258 crank; esp. easy since you already have the crank. The T-150 is a Ford (design) transmission, so the Ford small blocks will work too if you use a Ford bell.
     
  3. Sep 5, 2005
    tommyboys77

    tommyboys77 New Member

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    Thanks for the input, I belive it is the T150, I know it is a 3 speed and is the original trans. I would like to go with the 360 but not sure how many mods will be required to make it fit.
     
  4. Sep 6, 2005
    67cj5

    67cj5 Member

    Oregon
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    Oct 15, 2004
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    348
    Well you need the frame mounts for the motor and motor mounts. I am currently swapping in a 360 in a 83 cj7 and this is the only thing we needed to change so far. Fuel line needs to be rerouted, But nothing major.
     
  5. Sep 6, 2005
    KDX250

    KDX250 Member

    Parma Oh
    Joined:
    Aug 1, 2005
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    58
    I'm selling a new set of MORE bullet proof motor mounts that will work on a 304-360-401 eng swap. If you are interested let me know.
     
  6. Sep 6, 2005
    JeepManEd

    JeepManEd New Member

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    Aug 25, 2005
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    I believe the V8's also used a brace across the frame under the motor mounts. I am not sure if any I6's had this. Ed
     
  7. Sep 6, 2005
    jrh0558

    jrh0558 New Member

    Portage, Wisconsin
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    Dec 1, 2003
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    My 74 came with a 304 but did not come with cross brace on the frame under the motor mounts.
     
  8. Sep 6, 2005
    walterv

    walterv Member

    Yakima Wa.
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    Sep 1, 2004
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    202
    My 75/304 does not have a cross brace either. Don't remember seeing that cross brace on any V8.
     
  9. Sep 6, 2005
    wingtime

    wingtime Member

    Clearwater FL
    Joined:
    Mar 20, 2003
    Messages:
    143
    Some late model CJ's had a brace bar that went across the frame between the motor mounts. I don't think it did very much though.

    As mentioned above all you need is the passenger side (I think) engine frame mount from a CJ that came with a factory V-8. With the current gas prices I would personally be thinking of somethingother than a V-8. LOL

    The stroker swap is a great idea in my book.
     
  10. Sep 7, 2005
    KDX250

    KDX250 Member

    Parma Oh
    Joined:
    Aug 1, 2005
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    58
    You will need the right side frame mount, both eng. mounts and the rubbers from a cj that had a v8. Do not use the ones from a wagoneer or pick up. Those mounts are to tall. Did the same swap alittle while ago. Good luck.
     
  11. Sep 14, 2005
    tommyboys77

    tommyboys77 New Member

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    Apr 2, 2005
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    Thanks guys for all the help! I found a rebuilt 304 on ebay and I am in the process of doing the swap. I let you know how it goes....Just for kicks I picked up a 75 CJ in the middle of restoration, it was basically a complete cj just not put together. I am pulling the engine and axles and will part out the rest if anyone is interested.
     

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