4.0 Head Swap - JeepForum.com

 
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post #1 of 9 Old 01-09-2009, 09:17 AM Thread Starter
j33pman
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1984 CJ7 
 
Join Date: Jun 2007
Location: Cobleskill, NY
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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


Bill H. - 1984 CJ-7
Now with Fiberglass!
My Rebuild thread
http://www.schohariecountyjeepclub.org
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post #2 of 9 Old 02-05-2009, 06:45 AM
sgtbookie
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Just started researching this and found your post Bill. Have you started your conversion yet?


2005 LJ Rubicon Sahara #380
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post #3 of 9 Old 02-05-2009, 07:40 AM
CJ Chet
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Here is something I found:

http://jeep.off-road.com/jeep/articl....jsp?id=277013

'86 CJ7
'04 AEV RUBICON
2015 Grand Cherokee Limited
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post #4 of 9 Old 02-05-2009, 07:52 AM
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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post #5 of 9 Old 02-05-2009, 11:19 AM
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

'84 CJ7
'03 Overland
98 other cars/trucks/vintage trailers owned previous to CJ (Scary isn't it!), no wonder I'm broke
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post #6 of 9 Old 02-05-2009, 01:18 PM
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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post #7 of 9 Old 02-05-2009, 01:31 PM
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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post #8 of 9 Old 02-05-2009, 02:56 PM
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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post #9 of 9 Old 02-05-2009, 03:07 PM
Bubba Ray
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Location: SC
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I would love more info on this swap. Will be doing it soon.
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