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Unread 12-07-2012, 10:36 AM   #1
tongesj
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V8 to I6

Hey guys, I have a 77 jeep cj7. It has an AMC 304 V8, and i want to swap the V8 out for an AMC I6. I was wondering if the engine mounts are the same, or do i have to weld in different mounts? Anybody know? Thanks.

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Unread 12-07-2012, 05:46 PM   #2
BlueRubiconrich
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no one go's backwards
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86 CJ7 258,T18,Scout Dana300,twin sticks,Dana44's,4W Disc, locked,35's,YORK OBA,Warn 8274,fullcage.
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Unread 12-09-2012, 08:13 AM   #3
frhrwa
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Quote:
Originally Posted by BlueRubiconrich View Post
no one go's backwards
why not? some people aren't in a jeep for racing, and the I6 is plenty powerful enough to go anywhere.. not sure about weight, but I would imagine he'll lose some weight up front too..
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Unread 12-09-2012, 09:28 AM   #4
mncdriver
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Bell housing are the same, the 258, if that is what he is going with is just a bit lighter, 30 pounds maybe. not sure why he wants it, but 258 are good engines.
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Unread 12-11-2012, 05:36 PM   #5
Luke95
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4.6 would be a nice swap!
6 in a row makes the hoe go!
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Unread 12-11-2012, 06:58 PM   #6
nshefbuch
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360 would be the best of upgrade and cheapest if you are talking about rebuilding a motor. Talk about easy too, bolts right in.

I6 yes is a great motor but no where the power of a 360. Rebuild the 360 and use aluminum intake and four barrel and your easily close to 300hp and plus on torque. The main thing is oiling and any decent engine rebuilder can take care of that.

All those stroked out Inlines don't put out the claimed power and don't last long either. A 258 is already stroked from a 232 so stroking anymore is decreasing the life of the motor.
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Unread 12-11-2012, 07:03 PM   #7
Luke95
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I would start out with a 4.0 and go with a 258 crank it last pretty good and you can find a 4.0 with harness for supercheap on C list
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Unread 12-12-2012, 10:38 AM   #8
69moparman
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Quote:
Originally Posted by tongesj View Post
Hey guys, I have a 77 jeep cj7. It has an AMC 304 V8, and i want to swap the V8 out for an AMC I6. I was wondering if the engine mounts are the same, or do i have to weld in different mounts? Anybody know? Thanks.
Look at the inside of the frame rails where your V8 mounts are. There is a second set of holes in the frame. After removing the engine, unbolt the mounts and move them to the other set of holes. Then just drop in the 258. It should bolt right up to the bell housing without an adapter, and I think the clutch is also the same.
I'm looking to go the opposite way, swapping out my 32K mile 258 for a 304. That is, if I can find a good 304.
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Unread 12-14-2012, 09:38 PM   #9
sjsst41
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I'm 99% sure you'll need the I6 mounts, partially for one side anyway - The drivers side mount bucket is the same, the passengers side would need to be sourced from a setup that had a 258 motor in it, you'll also need the engine side mounts (for both sides) from a 258 setup, the 304 parts will not work. I bet you'd be able to find someone who'd swap mounts with you, since the V8 ones are typically desirable.
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Unread 12-20-2012, 10:07 PM   #10
cavscout187
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Upgrade to fuel injection on a360 I just got rid of the tractor motor for something that will actually move the Jeep..side not magnum v8 is a lower power band engine so not racing motor but 330flbs of torque from almost idle..much better on any hill and gets better mileage
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Unread 12-22-2012, 09:37 AM   #11
sjsst41
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What fuel injection kit did you go with - how was the setup, etc, etc. I'm running the redneck FI kit (Motorcraft carb ) but this next year I want to source a kit, looking for opinions.

Sorry to hijack the thread.

Quote:
Originally Posted by cavscout187 View Post
Upgrade to fuel injection on a360 I just got rid of the tractor motor for something that will actually move the Jeep..side not magnum v8 is a lower power band engine so not racing motor but 330flbs of torque from almost idle..much better on any hill and gets better mileage
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Unread 12-22-2012, 11:09 AM   #12
cavscout187
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I went with a magnum motor factory fuel injection super simple easy to get running
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