Rebulild 304 or get a crate 350 or 360 crate motor? - JeepForum.com

 
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post #1 of 8 Old 09-05-2013, 02:34 PM Thread Starter
hunt5483
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1974 CJ5 
 
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Rebulild 304 or get a crate 350 or 360 crate motor?

I got a 74 cj that we are restoring from frame up. This is something me and my old man are doing together and so glad I found this sight looks like there are a lot of good folks on here. My question is should we rebuild
the amc 304 or go with a crate motor like a 350? I know parts are easier to get with the 350. Anyones input is appreciated ill post pics of build soon. Thanks Hunter

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post #2 of 8 Old 09-05-2013, 04:26 PM
Chewtoy
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Depends on what you want to do with it. Are you doing a full period show and shine restoration? If so you have to stick with the 304. Are you making a play toy to beat around the beach, desert or mountains with? Do you want to keep it "pure" AMC? etc etc etc.

What are you going to do with the Jeep when you are done building it?

With a great Jeep comes an empty wallet.
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post #3 of 8 Old 09-05-2013, 06:16 PM
Jeeper44mag
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What he said. It all depends on what you're going to do with it. For massive hp, it's undoubtedly cheaper to just swap in a 350-360. If you want to keep it mostly stock, the 304 is the way to go.

Personally, I intend to rebuild my 304 eventually and just upgrade cam/carb/etc. for a solid torque curve and 250ish hp (which should be pretty easily attainable without TOO much $$).

Luis

'78 CJ7, 304, ps, pb, A/C, ~3" Lift, 12.5"x33" MTZ's., T150/D20, D30/AMC20, 4.56.
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post #4 of 8 Old 09-12-2013, 11:55 AM
MrElPoderozo
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Go with a AMC 360 you wont be disappointed. I personally don't like to put Chevy parts on a jeep,in my opinion is not worth the trouble. I have seen some guys putting a 454 BBC on a CJ and when its all said and done they end up having to take short cuts and welding motor mounts to the frame,cutting,hitting the headers tours the inside so that the steering column fits correctly,etc......,.The Geometry of it its all wrong and they had to deal with it and try to fix it best they can and some people just get frustrated and end up doing an ugly job. When all they had to do is put a AMC 360 in there and everything bolts right in,electrical wires,motor mounts,transmission,radiator wont need to be changed PLUS it will look a lot better in my opinion.I don't know what you are trying to do with this project and I don't know what the budget is but if you choose to go with a SBC eng. there are a lot of problems that you must be prepared to deal with as you encounter them.I say go with the AMC 360 and do a little homework to build the amount of horse power you would like,its less hassle,that's just my opinion,ok,Good luck to you :0)
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post #5 of 8 Old 09-12-2013, 05:43 PM
mattl
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I'd rebuild the 304 or stab a 360 or 401 into the Jeep for even more power. You already have the platform for motor mounts, electronics, radiator, etc. It just makes sense to me to keep the AMC engine.

1986 CJ7, AMC 360, NP435, D300, Tera60 w/Detroit, D44 welded, SOA, 37" MTR
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post #6 of 8 Old 09-12-2013, 10:55 PM
jeepsterdk
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Rebuild the 304 if you're not power hungry. The 304 is a good engine, and you can keep it AMC. The Chevy engine....well, in my last CJ5 i swapped in a 454 BBC and after that I swapped in a 350 SBC. The 454 sure was fun, but in the CJ7 I'm building now, I chose to go with the 304 AMC. I simply got tired of seeing those nice CJ's with chevy parts. If you need more power and torque, build an AMC 360 or 401. They can put out some serious HP! I had a 360 in my CJ5. It had an Edelbrock camshaft kit, headers and an Edelbrock 650 carb. The amount of torque was unbelievable. It could smoke my 35x15.50 TX's on dry pavement. With the stock axle gearing!. The 350 SBC, although build, couldn't do that. So....keep it AMC.

1978 CJ7 | 360 AMC | TH400 | AMC20 | YJ springs
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post #7 of 8 Old 09-13-2013, 07:05 AM
Matt1981CJ7
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Quote:
Originally Posted by Jeeper44mag View Post
Personally, I intend to rebuild my 304 eventually and just upgrade cam/carb/etc. for a solid torque curve and 250ish hp (which should be pretty easily attainable without TOO much $$).

Luis
Luis,

Unfortunately, I think you're underestimating how much it will cost to rebuild your 304, especially if you shoot for those lofty performance numbers.

It adds up fast, trust me.

Matt
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post #8 of 8 Old 09-13-2013, 09:15 AM
jeepsterdk
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Agree with Matt: Around 250hp in a 304 will cost you a whole lotta $$. Shoot for 180hp and nice low-rpm torque. That's what AMC's are best at IMHO

1978 CJ7 | 360 AMC | TH400 | AMC20 | YJ springs
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