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Unread 06-05-2014, 09:34 AM   #1
chris989604
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1980 CJ7 
 
Join Date: Sep 2013
Location: las vegas, nv
Posts: 177
401 realty of overheating.

Hello all,

I have a 360 and a 401 to start building. I built a great 360 before and have no worries about going that route again. I would like to build the 401 but i hear stories of overheating.

My question is, Who is running a 401 (350-425hp) in a cj.. My concern is i have an auto trans and AC already taxing this small radiator space. Are these overheating issues from guys who run subpar parts or is this block really that hard to keep cool. Are the stories just that, stories repeated over and over.

I live in nevada so temps are over 100 half of the year. I am running 4.88s so i know it is a tall order for either motor. Anyway,, first hand experience would be great.

Thanks in advance,
Chris

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Unread 06-05-2014, 09:38 AM   #2
UBERK
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Should have my rebuilt 401 back in my CJ within a month...didnt have any overheating issues with it prior...in Phoenix.
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Unread 06-05-2014, 11:35 AM   #3
chris989604
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Quote:
Originally Posted by UBERK View Post
Should have my rebuilt 401 back in my CJ within a month...didnt have any overheating issues with it prior...in Phoenix.
was it a std bore or .030? .060??

Thanks
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Unread 06-05-2014, 11:39 AM   #4
UBERK
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Was bone stock; '74 vintage. Is .030 now. Just had OE radiator rodded and pressure tested, going to stick with it for now.
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Unread 06-05-2014, 11:42 AM   #5
Dusty_CJ7
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I have a 401 i my '79, and occasionally will deal with some heat issues if I don't have much air moving through the radiator, but only in the summer (in AZ) with temps well over 100 degrees. You're not gonna see me out wheeling in that weather though.
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Unread 06-05-2014, 11:57 AM   #6
CSP
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A couple of friends I wheel with have built 401s, one is 0.030 over and the other is 0.040 over, and neither have cooling problems. One has pushed the dyno to over 425hp and has a slushbox trans. The other has a T18 manual trans. We will wheel in Moab with temps in the low 100s.
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Unread 06-05-2014, 01:35 PM   #7
motiv8ya
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I'm in Vegas and I have a .040 over 401/th400 in my 79' with no cooling issues. I am still putting miles on my other fresh .040 over 401/t176 in my 77' as I slowly brake it in. Four core radiators, contour fan swap and vented hood on both CJ's for a little extra insurance.
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Unread 06-05-2014, 05:15 PM   #8
chris989604
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Quote:
Originally Posted by motiv8ya View Post
I'm in Vegas and I have a .040 over 401/th400 in my 79' with no cooling issues. I am still putting miles on my other fresh .040 over 401/t176 in my 77' as I slowly brake it in. Four core radiators, contour fan swap and vented hood on both CJ's for a little extra insurance.
Good to know, I am going to drop the block of at universal machine tomorrow and have it checked out.

On another note,,, how did you get the 400 turbo in the cj. that must be a short drive shaft. I have a 400 dana20 set up i am trying to get rid of if you know anyone local that can use it.
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Unread 06-05-2014, 10:39 PM   #9
CSP
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The '76-79 CJ7s were available stock with the TH400 and quatratrac tcases.
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Unread 06-06-2014, 01:21 AM   #10
motiv8ya
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Quote:
Originally Posted by chris989604

Good to know, I am going to drop the block of at universal machine tomorrow and have it checked out.

On another note,,, how did you get the 400 turbo in the cj. that must be a short drive shaft. I have a 400 dana20 set up i am trying to get rid of if you know anyone local that can use it.
I used a 401/TH400/QT setup out of a 79' cherokee, swapped the tailshaft, installed the dana20 adapter and bolted it in with factory 79' CJ7 crossmember. No issues with the rear driveshaft length.

I may be interested in the setup you have if the TH400 has an AMC bellhousing. It's always good to have a spare setup on the shelf. I never know when I'm gonna stumble across my next build project. PM me
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Unread 06-07-2014, 09:47 AM   #11
chris989604
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it has an adapter for the bellhousing to block, it is on CL in las vegas if you want to check it out or pm me.
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