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Unread 04-14-2009, 10:44 AM   #1
Hybrid Jeep
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1976 CJ5 
 
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Build 401 or 360

Hey guys.. I happen to have an AMC 401 and an AMC 360... was wondering which engine you guys think I should have rebuild for my 1976 CJ5.

I've heard that the 401 is too much power in a CJ... I have a Dana 30 up front and a Trussed Moser 1 Piece AMC 20 in the back.

The 360 is less expensive to have rebuilt... but the 401 is just so damn cool!!

What do you guys think.. should I put the money in the 401 or the 360!!

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Unread 04-14-2009, 11:08 AM   #2
JeffJ
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I have the 360 in mine, but would go with the 401 if given a choice. The 401 is not to much power for it.
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Unread 04-14-2009, 11:58 AM   #3
Dad03
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Quote:
Originally Posted by Hybrid Jeep View Post
Hey guys.. I happen to have an AMC 401 and an AMC 360... was wondering which engine you guys think I should have rebuild for my 1976 CJ5.

I've heard that the 401 is too much power in a CJ... I have a Dana 30 up front and a Trussed Moser 1 Piece AMC 20 in the back.

The 360 is less expensive to have rebuilt... but the 401 is just so damn cool!!

What do you guys think.. should I put the money in the 401 or the 360!!

To much power Is that possible?
Go big or go home.
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Unread 04-14-2009, 12:00 PM   #4
BriansCJ
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I am getting a 401 built in the next couple years with fuel injection for my 5. When the build is done.
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Unread 04-14-2009, 12:15 PM   #5
GP_Pete
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Definitely go with the 360.....



....and then sell the 401 to me. It obviously is too much motor for you.
I will take it off your hands my friend.



Seriously. This isn't really a discussion. 401. I love my 360, but each night I dream of all the driveline parts i could be breaking with a 401.
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Unread 04-14-2009, 12:33 PM   #6
rixcj
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I had a 401 in my CJ5, and it just died ( so to speak ), so, I'm putting in a 360 that I had, as an interim motor.

I just bought another 401, and it's getting shipped here this week. Once you've had one, there's no turning back!

In all actuality, a nice 360 should be plenty of power in a CJ, but....
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Unread 04-14-2009, 12:48 PM   #7
Hybrid Jeep
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Haha.. well that was easy I suppose!

I've already torn apart the 401 and it appears that it was recently rebuilt as the inside was rather clean and it had stampings on the rod caps..

I unfortunately threw away all the bearings (even though they were in good condition) :

Is there an easy way of seeing if the bearings were standard sizewithout purchasing some and using plastigauge?

Also.. how serious is a cracked rod?
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Unread 04-14-2009, 04:08 PM   #8
happydog
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Hey Hybrid,

Don't use a cracked rod.

I have a good running 401, comes complete with a Wagoneer.
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Unread 04-14-2009, 07:13 PM   #9
letchcore
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401 baddest engine ever built! Plan on a good radiator too.
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Unread 04-15-2009, 11:37 AM   #10
wendell
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I'm not big on V-8's in jeeps, however, if I was going to do one, I would go with the biggest and badest AMC engine, the good old 401.
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Unread 04-15-2009, 11:48 AM   #11
Hybrid Jeep
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Well.. I guess the decision has been made!!

To rebuild the 360 it will cost about $1500.. the 401 $1900.. so I suppose I might as well rebuild the 401!

Will keep you guys updated...
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Unread 04-15-2009, 11:48 AM   #12
PavementPounder
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Saying a "401 is too much power" is a lot like saying "guns kill people". Its not the motor that breaks everything - its you (or your foot, rather). You will probably break your Dana 30 rather easily if you are not careful with it. Plan on upgrading the front axle in the future. Sticking with the 360 wouldn't change that much, either.

I'm not convinced of a significant cost difference in building a 401 vs. a 360 (until you mentioned the rod). The heads are the same between the two motors and general machining costs are the same between the two motors, leaving not that many parts to be more expensive. You can build the 360 to match a mild 401. It all depends on the choices you make.

I don't think you care what the bearings were that you threw away. You want to buy bearings for what the crank currently is. Measure the crank.

Don't use the cracked rod. 401 rods are forged, so that could be a PITA to replace. Scan Bulltear and IFSJA for a rod set or place a Wanted Ad there before resorting to eBay. There are a few well-known AMC-friendly shops that hang out on Bulltear and IFSJA there who may have incomplete rod sets sitting around.



Edit: I need to type faster.
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Unread 04-15-2009, 12:44 PM   #13
duffer
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Amen, pounder. Bluntly, you can never have too much power in a CJ. It's all about how you use it and keeping tire size and components compatible.
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Unread 04-15-2009, 02:02 PM   #14
motiv8ya
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I've run a 304 then 360 and I currently run a 401 that I rebuilt in my 7 . The AMC V8's are easy motors to rebuild and the 401 has plenty of power and torque. You won't regret putting in the 401.
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