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Old 02-14-2014, 10:39 AM   #1
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Engine swap

I have a lot of jeeps all cjs i have one i really like its got a 258 with a 3 speed i want to put a 304 in it i was wondering will the 304 bolt back up to the tranny jeep is a 1979 cj5 and does any one know the best place to find a 304 thanks

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Old 02-14-2014, 10:48 AM   #2
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yes..from 1972 up the 258 and all AMC v8's had the same bell housing bolt pattern..where to find one?..I have no idea..I like putting small block chevys in mine

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Old 02-14-2014, 12:11 PM   #3
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thank you very much is there a way on this site to ask every one if some one has a 304
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Old 02-14-2014, 12:18 PM   #4
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yes..once you have 15 posts you can post in the wanted section of the classifieds..just make comments on different threads and you can build up to 15 in just a few minutes
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Old 03-05-2014, 10:50 AM   #5
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While I like the sound of a V8, the 304 really isn't much, if any, improvement on the 258. A 304 will also be harder to find than a 258 or any of the other, larger AMC V8's (360, 401). Although there are the short deck 343/390's around, probably best to stay away from those from a parts availability standpoint. If you want an AMC V8, the 360's are by far the most common and will bolt-in just like the 304.

That said, I'm 100% with Harley and if doing any engine swaps in CJ's, the ubiquitous small block Chevy is my only choice. You can build them just about in any configuration you can think of in at least a dozen different displacements with all factory parts. And you can't find any cheaper parts. That and they just plain work. Way more power for the buck than any of the AMC's and, in my experience, they get way better mileage.

Best application for AMC V8's? Do you have a boat and need a mooring device?
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Old 03-05-2014, 03:38 PM   #6
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V8's are a good way to go I am doing a 5.3L Vortec
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Old 03-06-2014, 06:32 AM   #7
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FWIW, the AMC 360 is the same block as the 304 and IMHO would be a better choice than the 304. These can be found in many salvage yards in many different Jeeps and AMC vehicles. Easy bolt in using all stock parts as well which makes it really nice though there aren't as many go fast parts as there are for the SBC if that's your thing. Because you're able to use all stock parts, typically the swap will be a little cheaper using the AMC motor. That AMC V8 will build plenty of power for you as well without a lot of coin as there are a fair Jeep owners with SBC transplants with egg on their face after talking smack but weren't able to keep up with my AMC powered CJ!

So, depends on your needs. If going full blown race motor ( which I doubt you are since you are looking at a 304) I would go SBC just due to the availability of go fast parts.

If just going for a trail rig motor for reliability and more power than the I6, I would go with an AMC 360.
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Old 03-06-2014, 06:40 AM   #8
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I love the 5.9L V8 AMC motor in my 79 CJ but it's a lot of old school torque/power. Not that it's a bad thing!!
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