Is the 304 in a CJ and a scout II compatible? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 01-31-2007, 01:05 AM
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Is the 304 in a CJ and a scout II compatible?

Is a 304 out of a '78 int. scout the same as the 304 in a '79 CJ-7? What, if any differences exist between the two?

I am asking because I just purchased the CJ which has a bad 304 in it. The current engine would probably need bored out, so it's not worth the expense to rebuild.

The donor 304 would come out of a '78 scout II with 98k miles on it. I also have access to a 360 which was running when parked(w/89k miles), but would surely need gaskets replaced. Or a freshly rebuilt 258, but I'd assume it would require other work considering its a totally different engine than I have now.

I am somewhat new to jeeps, so any advice would be appreciated.

Its got a auto tranny, holley carbs and quad-trac if that matters(sorry no engine pic)
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post #2 of (permalink) Old 01-31-2007, 02:47 AM
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Re: Is the 304 in a CJ and a scout II compatible?

IN short NO!! The AMC/Jeep and International 304's are completely different internally and externally. A International 304 would be a very expansive and poor choice for an engine. For your information International used a 232 and 258 that where basically AMC 232 and 258's but used different blocks with different external bolt patterns. This has lead many to assume that the International and AMC 304 is the same internally IT IS NOT.

Provided the 258 you mention is an AMC/Jeep 258, it should bolt in with only a change of driver side motor mount. Be aware that you will need a 258 flex plate as AMC engines are externally balanced. Also will want a torque converter matched to the 258 for good proformance and mileage.

Of the engines you mention the 360 would be the best choice, Provided it is a AMC 360 and not a Dodge 360 (Completely different engine). It should bolt in directly needing only a Flex plate balanced for a 360 and may need a different Torque converter for best performance and mileage.

If you plan to stay carberated they An AMC 304, 360 of 401 will be the best bang for you buck. If you want fuel injection then it would be best to swap in a fuel injected AMC 4.0, Chevy 305, 350, Ford 302, 351, or Dodge 318, 360.

For your information the Holly carb is not stock, the stock carb would be a 2 barrel motor craft (MC)2100 with 1.08" venturys. The stock Auto trany is a TH 400 this is internally similar to the Chevy TH 400 but with AMC input and output bolt patterns.
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post #3 of (permalink) Old 01-31-2007, 06:05 PM
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Re: Is the 304 in a CJ and a scout II compatible?

Could have said it better my self!

No parts interchange between the IH and Jeep engines, nor will the engines interchange.
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post #4 of (permalink) Old 02-08-2007, 09:50 AM
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Re: Is the 304 in a CJ and a scout II compatible?

I believe that the ANC 304, 360 and 401 are interchangeable as far as bolt patterns. The difference probably lies in the compression ratio, camshaft, valves and so on. I would expect that the 304 would have similar variations since those were the years that they were making lots of changes for emission control.

Check back - someone with more knowledge of the V8s will probably provide a better answer.
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post #5 of (permalink) Old 02-09-2007, 09:17 PM
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Re: Is the 304 in a CJ and a scout II compatible?

All AMC V8s and AMC 232, 258, & 4.0 I6s have the same bell housing bolt pattern at the back of the block and are interchangeable. The motors are externally balanced so you need to use the right flywheel/flex plate for the displacement of the motor. (ie- an AMC 360 flywheel will not work on an AMC 401) You do have to move a motor mount to go from the I6 to V8 and vice versa.

Donít pass on every International you come to when searching for a motor as the 72 (I am not sure how many years on either side of that number it was available) International 400 that is found in the Travelall is really an AMC 401 with the proper Jeep bolt pattern. Remember to look under the exhaust manifold as the displacement is always cast into the side of the block.

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