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Old 12-09-2019, 09:29 AM
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1974 318 in my YJ?

I have the opportunity to get the 318 out of my dadís 74 Barracuda. Itís been sitting a long time and will most likely never go back in.

Iím a good mechanic, but canít weld. Would it be unreasonable to think of doing this swap? I read itís ďeasyĒ to do a 350 swap.

Iíd want to keep it a manual as well, so Iíd need to find a transmission.

I have the 2.5 now and know nothing of itís history. My Jeep has 248k miles on it, so engine options are always in the back of my mind.

Probably need new axles too, as I suspect my stock axles would be stressed by the 318. My Jeep is a cruiser, as I live in IA and we have no trails. It may get to CO, but would be treated lightly.

Just dreaming here. Thanks for the guidance.




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Old 12-09-2019, 11:28 AM   #2
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With a 2.5 you have a AX5 not the strongest transmission even for the 4 banger. So, yes you will need a transmission, a t-case, at least the rear axle D35 is not strong enough for a V-8. a '74 motor will not be computer controlled so you will either have to figure out how to convert the gauges to work with that motor or replace the gauges with mechanical ones.
Along with a plethora of other things that need to be converted or changed out.

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'94 YJ 5sp 5.13, Super 35, HP30 w/Aussie, sitting on 33's, RE chromo drag link, 9500 Lb winch, 3" lift, 4x4 Posi Lock, it's a resto-mod in progress.
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Old 12-09-2019, 12:22 PM   #3
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I would rather have a fuel injected 2.5 than anything with a carburetor especially a 318
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Old 12-09-2019, 12:26 PM   #4
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I probably wouldn't.... such a huge project to end up w a carburetor.... welding absolutely will be requires along with quite a bit of custom work...

Unless this is a sentimental thing, choosing that engine because you happen to have it is probably not a good idea...

If that engine is stock, the axles are plenty strong.... at only 150 hp it isn't going anywhere fast...

Personally I think you are likely underestimating the project as most folks do....
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Old 12-09-2019, 12:31 PM
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Thanks! This site helps keep it real! Iíll skip this idea for now.


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Old 12-09-2019, 12:43 PM   #6
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Advanced Adapters may have the required motor and transmission adapters that you'll need. I expect the motor mounts will need to be welded.

12b assumes your YJ is 1991 or newer. If so, he's correct in stating the gauges will probably require replacing. If your YJ is '90 or older, the gauges aren't computer controlled so you should be able to use them. He gives you a good list of items to consider as far as the transmission, transfer case and axles go. For the plethora of other things to consider I'll add driveshafts and wiring.

A Chevrolet LT1 (aluminum block) weighs close to the weight of a YJ 6 cylinder motor. I don't know how much a 318 might weigh. Since the 318 has been sitting for a long time, it will most likely require refreshing or a complete overhaul. Why was it removed from the Barracuda?

For all projects, there's a degree of practicality. If you're truly considering an engine swap, you might consider the amount of support that a 318 swap has vs. the amount of support that a SBC swap has.
Since you already have the 318, that cuts the cost of locating and buying an LT1 and could be more cost effective even if the 318 needs overhaul.

If you fill out your signature, it'll make responding to your questions easier to give you more accurate suggestions.

Good Luck, L.M.
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Old 12-09-2019, 07:02 PM   #7
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IMO that would be a pretty cool rig once done. Simplicity, 318, NP435 trans and a 205 case. Throw in a D44 rear and you have a bomb proof old school setup. Might add an extra 600 lbs to the mix but what the heck. Some wouldent swap that FI and electronics for a carb for love nor money. Me, I'll take a setup that if it craps out in the middle of nowhere I can diagnosis it and get it going again. I understand the point of modern electronics and the like, but when my old 63 GMC PU with a 305 V6 and 4speed got 23 mpg on the highway, which is better mileage than any full sized truck,jeep or SUV we've owned, I'm not really all that giddy about modern engine management systems. Taint nothing like the sound of a V8 with a nice healthy exhaust. I say DO IT!!
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Old 12-09-2019, 08:13 PM   #8
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‘74 was a relatively terrible year for a lot of things. Chrysler engines were no exception. The cylinder heads on those 318’s were the same anemic cylinder head used on the 273, with Intake valves measuring a whopping 1.78”.

The only things worse for the American car manufacturers were ‘75-‘78 (ok maybe until ‘83 even) model years.

All that isn’t to infer that the 318 is unreliable. They ran forever with proper maintenance, and the earlier LA (“Lightweight A’s”) made a respectable (for the time) 230 HP/340 lbs. ft. Torque from a no compression two barrel. Unfortunately, due to the Arab Oil Embargo, and the impending doom of Congress enacting the CAFE standards, the HP was reduced to 150 (as Gottagofast eloquently points out) for ‘74, and a whopping 145 for ‘75. Hello to the biggest catalytic converters on the planet and thanks for nothing smog Gods.

Anyway, sorry for the rant, but a small block Chrysler product of that vintage would be best in a Chrysler product of that vintage.
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Old 12-09-2019, 09:41 PM
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1974 318 in my YJ?

We pulled the 318 out of the Cuda 20 years ago and replaced it with a well built 360. Along with other mods, it went from a 16 second car to a 13 second car.

Sadly, dad is selling the car, and there will be parts left behind. Jeeps donít require high HP, so I thought it would be fun to put the old 318 in it. I canít afford to buy the Cuda myself, though I could if I moved some money around, but it isnít worth excessive taxes for nostalgia. I grew up in that car as moms Daily driver until the late 80ís, when we restored it.

Plus, my wife tolerates the Jeep, but HATES the Cuda.

By posting here, Iíve learned a reman 2.5 is the right direction for my 95, someday, if I ever need to do a swap. Itís fun to learn, and this was a great post for that.

Thanks for all of the input!


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Old 12-09-2019, 10:13 PM   #10
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Quote:
Originally Posted by svtrit View Post
We pulled the 318 out of the Cuda 20 years ago and replaced it with a well built 360. Along with other mods, it went from a 16 second car to a 13 second car.

Sadly, dad is selling the car, and there will be parts left behind. Jeeps don’t require high HP, so I thought it would be fun to put the old 318 in it. I can’t afford to buy the Cuda myself, though I could if I moved some money around, but it isn’t worth excessive taxes for nostalgia. I grew up in that car as moms Daily driver until the late 80’s, when we restored it.

Plus, my wife tolerates the Jeep, but HATES the Cuda.

By posting here, I’ve learned a reman 2.5 is the right direction for my 95, someday, if I ever need to do a swap. It’s fun to learn, and this was a great post for that.

Thanks for all of the input!


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Now THAT (the 360 swap) is the good part of the story (except for selling it). I hate to hear the stories about when it becomes the time to sell. Always seems tough, for any of us. I hope he gets top dollar for it and the money goes for a good cause.

Additionally, I apologize to anyone who had to read my unedited previous post. I unfortunately was less than the human I try to be today, and may have come across as a juvenile donkey!

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