amc 304 in a YJ? - JeepForum.com

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post #1 of 30 Old 01-10-2011, 12:28 PM Thread Starter
88MNYJ
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amc 304 in a YJ?

I've got an 88 yj with the 258. I was wondering if a 304 would be an easy fit in it. Since they were in the cj7 model, could i use those same engine mounts, trans, wiring?

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post #2 of 30 Old 01-10-2011, 03:33 PM
TnTRacing28
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Its not hard to swap it in...i have the AMC 360 in my current Jeep

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post #3 of 30 Old 08-22-2014, 11:24 AM
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Not to drag up an old thread, but what motor mounts did you use? I've got a set of CJ V8 mounts. Can they be bolted to a YJ frame?

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post #4 of 30 Old 08-22-2014, 11:46 AM
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the yj frames are not bolt together, like the cj were. you can try using the stock point for the 6 but will probably need to cut the yj ones off and weld/bolt on the cj mount arms.

if its anything like a 302, the mount point will be moved from the stock 6 cylinder point and you will have tons and tons of room after you get the engine in

I don't feel like working on anything at this time so i sold my yj.
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post #5 of 30 Old 08-22-2014, 12:19 PM
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Quote:
Originally Posted by superj View Post
the yj frames are not bolt together, like the cj were. you can try using the stock point for the 6 but will probably need to cut the yj ones off and weld/bolt on the cj mount arms.

if its anything like a 302, the mount point will be moved from the stock 6 cylinder point and you will have tons and tons of room after you get the engine in
I know on CJ's one of the mounts (passenger I think) was the same between the 258 and 304.

I need to find a YJ donor first before I start thinking about much.

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post #6 of 30 Old 08-22-2014, 12:48 PM
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its way worth it to move to a yj and then a v8. i am in the middle of my 302 swap and i watch tons of v8 swap videos on youtube and cannot wait.

I don't feel like working on anything at this time so i sold my yj.
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post #7 of 30 Old 08-22-2014, 12:51 PM
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its way worth it to move to a yj and then a v8. i am in the middle of my 302 swap and i watch tons of v8 swap videos on youtube and cannot wait.
Looking at what my CJ5 needs, I'd rather find a YJ and drop the 304 I had for the CJ into a YJ and then swap the front sheet metal to make it look like a CJ.

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post #8 of 30 Old 08-22-2014, 06:29 PM
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Yup. That is definitely an option

I don't feel like working on anything at this time so i sold my yj.
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post #9 of 30 Old 08-22-2014, 07:02 PM
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The 304 is a dog. Why go thru the time and expense?

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post #10 of 30 Old 08-22-2014, 08:45 PM
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The 304 is a dog. Why go thru the time and expense?
Because I already have it, and it has a hotter cam and an intake & carb on it already.

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post #11 of 30 Old 08-22-2014, 09:26 PM
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I have always liked the 304 because so many people don't like the 304 LOL and it's a lot cheaper than stroking a 6!

That and I love the CJ look on a YJ

How many old threads actually convince *you* to read all 36 pages? http://www.jeepforum.com/forum/f12/length-envy-build-thread-629700/
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post #12 of 30 Old 08-22-2014, 09:32 PM
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Originally Posted by fishadventure View Post
I have always liked the 304 because so many people don't like the 304 LOL and it's a lot cheaper than stroking a 6!

That and I love the CJ look on a YJ
I'm a realist. If you want cheap HP, an SBC is the way to go. But everybody and their grandmother drops an SBC into an old Jeep. 304's seem cooler because they are more unique.

Plus the whole fact that AMC inline sixes used the v8 bell pattern, means they are pretty much bolt up.

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post #13 of 30 Old 08-23-2014, 11:33 AM
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Quote:
Originally Posted by dagr8tim View Post
Because I already have it, and it has a hotter cam and an intake & carb on it already.
That 304 is only going to give you a max of about 200hp. You might want to look at a 360 and you should be able to swap that cam over as well. A 304 just doesn't seem worth the effort. Heck, a 4.0L HO is going give you the same kind of performance.

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post #14 of 30 Old 08-23-2014, 05:47 PM
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FWIW time slips at New England Dragway back in the early 80s for some of the Javelins with 304s indicated they were getting A LOT more than 200HP out of some of those odd motors. Of course, in perspective, these days people drive in with cars putting out 400HP that are pretty much stock. In 1984 300HP from a 300-incher was quite an achievement for these street cars LOL but 13s for a DD weren't that common then...at least around here

How many old threads actually convince *you* to read all 36 pages? http://www.jeepforum.com/forum/f12/length-envy-build-thread-629700/
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post #15 of 30 Old 08-23-2014, 07:16 PM
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if your going to go big put a 401 in it and tell everybody that its a 304. id look.into a 4.8,5.3,6.0 injected gm myself instead of a carbed engine
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