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Is A 360 Too Much Engine?

Discussion in 'Intermediate CJ-5/6/7/8' started by billm006, Oct 20, 2020.

  1. Oct 20, 2020
    billm006

    billm006 Member

    Honeye Falls, NY
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    Thinking of replacing my 232 in a 75 CJ5 with a 360 I found locally. Is that too much weight? It looks like the old 232's were pretty heavy too. Will that kill my T14? I don't have a heavy foot but... Also- what else do I need to consider when thinking about the swap. Start slow and be gentle.
     
  2. Oct 20, 2020
    rejeep

    rejeep Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Rochester, NY
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    No it’s not too much
    It just is for your transmission long term
     
  3. Oct 20, 2020
    rejeep

    rejeep Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Rochester, NY
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    If you pass on the 360 lmk :D
     
  4. Oct 20, 2020
    Keys5a

    Keys5a Sponsor

    Florida Keys
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    A 360 is fine in an intermediate. I've done a couple over the years, essentially the same weight as a 304. A T14 will survive if your easy on it, but a T15 would be better. I had a '72 with a 390 in it with a T15. Never any driveline problems, but It did snap a rear leaf spring in half.
    -Donny
     
  5. Oct 20, 2020
    Iandavidh

    Iandavidh Member

    California
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    How much does a 360 weigh?
     
  6. Oct 21, 2020
    Fireball

    Fireball Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Pullman, WA
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    It can't weigh much more than the 304 that came from the factory in 70's CJs. It's basically a bored out 304.
     
  7. Oct 21, 2020
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    The 360 is a 304 with a bigger bore and better heads. Same crank, same block with a larger bore. No difference from the 304 in weight.

    The 232 weighs less than the 304/360. Comparing, the '70s 232/258 is not heavy.

    A V8 (304 or 360) uses different engine mounts from the 232/258 and puts the transmission in a different location. Bolts up but quite a bit changes, including the driveshaft lengths. I presume the longer T-15 used with the 304 makes up for the length change in part.

    The T-14 is not up to 360 power. It will break.

    If you want more power, suggest you go 4.0L HO with a stronger transmission. Excellent native MPI, drops on the existing mounts, significantly more power than a 232.
     
  8. Oct 21, 2020
    sterlclan

    sterlclan Member 2022 Sponsor

    exploring the...
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    Fwiw I unbolted a 232 and bolted in a304 didn’t change anything but the motor mounts.
     
  9. Oct 21, 2020
    RATTYFLATTY

    RATTYFLATTY I think you need a little more throttle

    Central MN
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    Don't forget about the radiator, I6's ran a 2 core, V8's had a 3 core. Also I believe the flywheel for the 360 is different than the 232,258 and 304. What is wrong with the 232?
     
  10. Oct 21, 2020
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    Each of the AMC V8s has a different flywheel: 290, 304, 343, 360, 390, 401. All different, all externally balanced. An inline 6 typically is internally balanced, not needing the external balance weight that the V8s do. This is a positive design characteristic of inline 6s. I believe the ring gear and thus the starter is different between the 4.0L and the 232/258, but either engine's flywheel will bolt up and be balanced right.

    The V8 flywheels won't even bolt up to a 232/258, and vice-versa.

    360 flywheels are available as an aftermarket part.
     
    Last edited: Oct 21, 2020
  11. Oct 21, 2020
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    The easiest swap is to replace the 232 with a 258. The '70s 258 makes 110 hp, while the 232 is rated at 100 hp. This does not seem like a lot, but a 10% increase will be noticeable. Back in the day, we did not see many 232s in new CJs, because the option from Jeep was ca $25 IIRC, and the weaker 232 would have been harder to sell. I only recall one 232 CJ, and that was one of the two last remaining CJ-6s in 1975 that the dealership bought.

    The first 4.0L makes 177 hp. Less displacement than the 258 but considerably more powerful. Considerably less torque than the 360 (285 vs 220) but comparable power (175 vs 177).
     
  12. Oct 21, 2020
    duffer

    duffer Rodent Power

    Bozeman, MT
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    Dave Williams widely used table. That said, I'm not sure how accurate some of it is.
    Engine Weights
     
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