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Unread 01-09-2009, 10:17 AM   #1
j33pman
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1984 CJ7 
 
Join Date: Jun 2007
Location: Cobleskill, NY
Posts: 962
4.0 Head Swap

I notice that we have a stickied write-up for a 4.0 swap
but no official write-up for a 4.0 head swap.

I've read some info and write-ups from other sites,
but I am wondering how these have held up after a few years
and any issues people have run into.

just to clarify, I'm not asking for 4.0 head swap information and I
do know how to use the search button,

I'm asking someone to sticky a 4.0 head swap write-up with
a detailed parts list and issues ran into.

If no one has one that we can sticky, I will step up to the task when I start mine and make a write-up for us to reference

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Unread 02-05-2009, 07:45 AM   #2
sgtbookie
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Just started researching this and found your post Bill. Have you started your conversion yet?
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Unread 02-05-2009, 08:40 AM   #3
CJ Chet
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1986 CJ7 
 
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Location: Yorktown, Virginia
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Here is something I found:

http://jeep.off-road.com/jeep/articl....jsp?id=277013
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Unread 02-05-2009, 08:52 AM   #4
foggybottombob
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There used to be a definitive write up on the internet by a guy named Tim Weaver. But it appears that all the Tim Weaver web pages are gone now. That is what I used to do my 4.0 head swap a few years ago. I have not had any problems with the 4.0 head other than making the intake manifold not leak air.
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Unread 02-05-2009, 12:19 PM   #5
Houdini
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Here's a link to the old Tim Weaver write up:
http://web.archive.org/web/200601120...ead/40Head.htm
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Unread 02-05-2009, 02:18 PM   #6
foggybottombob
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Quote:
Originally Posted by Houdini View Post
Here's a link to the old Tim Weaver write up:
http://web.archive.org/web/200601120...ead/40Head.htm
That link credits the 4.0 head with adding 40 hp. The old article I read said 25 hp. I think the 25 hp is closer to reality. I remember talking to the Clifford performance guy on the phone about the head change years ago and he was guessing it would make 20% over bone stock. That would be 23hp. So I think 40 is a bit unrealistic. But add an upgraded ignition and you get at least another 5.
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Unread 02-05-2009, 02:31 PM   #7
GPER
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The 40 would be with the FI on the 4.0 head swap. I think the main issues would be using the putty in the water jackets. I had mine drilled, tapped and plugged but mine is still on the engine stand.
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Unread 02-05-2009, 03:56 PM   #8
foggybottombob
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I used a clearwater FL head and it appeared to have the extra holes welded and ground flat.
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Unread 02-05-2009, 04:07 PM   #9
Bubba Ray
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I would love more info on this swap. Will be doing it soon.
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