Official 4.0 swap thread - Page 2 - JeepForum.com
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post #16 of 429 Old 12-20-2007, 04:21 PM
stephens_cj5
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Are you doing the full 4.0 conversion or just the head swap? I have a rebuilt 4.2 that will build on, if it's the 4.0 head conversion, TBI or MPFI..I don't know but it will be the 4.2 block.

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post #17 of 429 Old 12-20-2007, 07:29 PM Thread Starter
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I'm dropping the full 4.0 in there. My 4.2 I had was trashed, so I got the entire thing.

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post #18 of 429 Old 12-22-2007, 06:42 AM
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Wow, really glad I found this thread! I'm looking at buying a CJ with a SBC conversion, but the purist in me rebels at the thought of a Chevy engine in a Jeep. All four Jeeps I've owned before the JK had the 4.0 in them, so my first thought was, "How cool would it be to swap a 4.0 into a CJ?"

So this is a fairly straight-forward swap? There are companies out there that sell the adapters? Does Painless or anyone sell a wiring harness to just drop in there, or will it require splicing?

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post #19 of 429 Old 12-22-2007, 08:23 AM Thread Starter
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Actually, if you want to spend the money, their is a company that sells the 4.0 harness thinned out so that you just splice a couple wires that they have labeled and your done. Their website is www.hesco.us and the direct link to the harness is http://www.hesco.us/shop.asp?action=...052&catId=7902. It's a bit pricey, but I honestly wish I could validate affording it for myself. It took me 8-10 hours of work to thin my first harness, and now I'm going to have to do another as the first one got messed up in transportation to my Jeep from my house where I was spending spare time thinning it. Their are 0 adapters to physically bolt it in the CJ. All you need is a complete set of CJ motor mounts from a 4.2, and they will bolt right up. It is fairly straight-foreward. It takes some research, but I think when I am finally done with mine I am going to be very please I went with MPI over carb. If you have any more questions feel free to post-up or PM me. I'd like to see more people staying with the straight 6 instead of going to the 350 or the 304-360 route.

80 CJ5 in the process of a frame up resto
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The little stuff will kill me.
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post #20 of 429 Old 12-22-2007, 11:11 PM
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What manifold can I use when upgrading to the 4.0 head on the 4.2 block, the 4.0 or 4.2 manifold?
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post #21 of 429 Old 12-23-2007, 07:30 PM Thread Starter
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if staying carb you have to modify a 4.2 intake.

80 CJ5 in the process of a frame up resto
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The little stuff will kill me.
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post #22 of 429 Old 12-23-2007, 09:25 PM
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Not sure if I am going with the carb or TBI yet, most likely the TBI. Can I use the 4.0 intake. I have niether so whatever the answer is I have to buy it.
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post #23 of 429 Old 12-23-2007, 09:44 PM Thread Starter
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If you go TBI you also have to get a CJ 4.2 intake. Te only way you can use a 4.0 intake is if you go full MPI injection, then thats what you use.

80 CJ5 in the process of a frame up resto
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post #24 of 429 Old 12-24-2007, 08:44 PM
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Can you go tbi with a head swap or do a head swap with tbi? I am seriously thinking of purchasing the Affordable Fuel Injection TBI setup for my cj7 but I plan on doing the head swap in the next year or so.

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post #25 of 429 Old 12-24-2007, 09:09 PM Thread Starter
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Yeah, the TBI doesn't care what head it goes on, just has to be a certain CJ intake. You keep the CJ intake with the head swap. Personally, you could build the MPI for cheaper than buying that TBI.

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post #26 of 429 Old 12-25-2007, 02:07 PM
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Is there a thread for the MPI build as well as the Junkyard TBI or are you talking about the same thing? I'm struggling with either building a tbi or buying one. Free time is scarce in my life. Thanks. Dustin

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"Remember, Amateurs built the Ark, Professionals built the Titanic."
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post #27 of 429 Old 12-25-2007, 05:35 PM Thread Starter
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Quote:
Originally Posted by CompGuru
Is there a thread for the MPI build as well as the Junkyard TBI or are you talking about the same thing? I'm struggling with either building a tbi or buying one. Free time is scarce in my life. Thanks. Dustin
MPI is the most recent technology with 1 injector per cylinder. The TBI just has 1 or 2 huge injectors that fire in to the intake. Busted Jeep has an article on doing the TBI, and my article is basically the same as doing MPI.

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post #28 of 429 Old 12-25-2007, 08:12 PM
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OK. Um, where is your article located at? I want to get as much info as possible before I start collecting parts. I'm guessing the MPI is better. How much harder to complete is it? Thanks for your help. Dustin

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"Remember, Amateurs built the Ark, Professionals built the Titanic."
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post #29 of 429 Old 12-25-2007, 08:46 PM Thread Starter
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MPI is more difficult, I won't let it fool you. My article is located int he very first post in this thread. It says it's for a 4.0, but it will work on the same principal. You can get get it all from a Cherokee or such, and I'd do the head swap as well if I were you. Their is a vendor to buy the entire set-up from and it's pretty much plug and play. I can give you the link if you'd like.

80 CJ5 in the process of a frame up resto
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post #30 of 429 Old 12-26-2007, 12:35 AM
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I will check out the complete setup from your posting but would also like the link you suggested in case I can talk the wife out of the money. thanks. Dustin

1983 Jeep CJ7 White

Team Rush, Halogen Headlights, Nutter Bypass, more to come...

"There is no mechanical problem too tough that cannot be fixed by brute strength and ignorance."

"Remember, Amateurs built the Ark, Professionals built the Titanic."
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