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Unread 01-10-2014, 01:40 PM   #1
XLarge
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1985 CJ7 
 
Join Date: May 2013
Location: Stuttgart, Germany
Posts: 27
anyone knows this head?

I'm considering a 4.0 head conversion to my 258.
Since I live Germany where I can't find any junkyard to collect Jeep parts I have to order a head the USA.

Does anyone know this head?

http://pages.ebay.com/motors/link/?n...d=301063425933

Since I have to pay a lot of shipping I thought of buying a new head

My other choice would be a head from Clearwater

Any hints?

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Unread 01-10-2014, 03:03 PM   #2
Always2L8
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1982 CJ8 
 
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I think the general consensus is for the #7120 head as the preferred swap. The flow characteristics of 0331 head were reduced somewhat to achieve better emissions. Now I'm sure someone will come along and disagree. This link has all kinds of data on the various versions of the 4.0 thru the years. http://jeep4.0performance.4mg.com/tech_specs.html

I don't think a new head has any particular advantages over a properly tested and re-built head.

Good Luck

edit: I've heard/read that the 0630 heads were more prone to cracking. Haven't heard/read that about the 7120's as hinted at in your e-bay link. I would ask Titan what they mean by re-machining?
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Unread 01-10-2014, 03:11 PM   #3
XLarge
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I know this, but I think that head is a kind of aftermarket head. That's why I asked.

I think I will go with a reman 7120 from Clearwater

Thanks for your quick reply.
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Unread 01-10-2014, 06:29 PM   #4
gmakra
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the 0331 head is an aftermarket head I believe they are cast in China and sold to several vendors in the United States.
I have run the 07 cylinder head and now running the 0331 and I notice no difference if anything 0031 head seems to run slightly better.
the reason for this is the smaller exhaust port which keeps the exhaust gas velocity hi and helps with scavenging.
the 07 head is becoming harder and harder to find and I went through 3 cores that failed magnaflux at $35 a pop.
so I went with the 0331 head which was a new casting and have not had any problems with it.
the original Mopar head in the 0331 casting was prone to cracking the aftermarket Heads have corrected the problem.
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Unread 01-10-2014, 10:22 PM   #5
gmakra
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The 0331 head is from 4.0 year 2000 and up.
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Unread 01-11-2014, 02:30 PM   #6
james04si
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I have the 7120 head from Clearwater. It came ready to bolt on the 258 with the coolant passages already welded and milled. I did not use a high lift cam. Someone else here did and he had to have the spring seats machined and new springs installed in order to use his can choice though I believe Clearwater can do that for you if you let them know beforehand. I spoke with Bob there and he was pleasant and answers the few questions I had. My head arrived with no issues and the work done was top notch and I would go through them again in a heartbeat based off my experience with them.
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Unread 01-11-2014, 03:00 PM   #7
seabass1858
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had the 7120 on my 95 xj and flawless operation for the 310k miles on the engine.
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Unread 01-11-2014, 03:19 PM   #8
Always2L8
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I haven't kept up with things since my stroker build about six years ago and didn't realize new heads were being cast. I was a bit confused by the e-bay ad you posted since they advertise them as new, but they "re-machine" them? Whatever that means. Sorry if I confused the issue. Sounds like Gmakra has the info on them.

Good Luck
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Unread 08-20-2014, 12:42 AM   #9
XLarge
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thx to all. i just found a used #7120 casting in germany and did the swap successful.
i know in th us you do this a lot, but in germany this is not such a common swap, since we have the TÜV (technischer ÜBERWACHUNGS Verein) which makes such mods difficult.

i did blog my first steps though. Was really funny and did give me a lot more power.

See it on http://headconversion.blogspot.de
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