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ZJ and WJ Grand Cherokees (1993 - 2004) Technical forum for the classic ZJ and WJ Grand Cherokees.

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Old May 2nd, 2022, 17:07
Hexagone Hexagone is offline
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04 WJ cylinder head question

I have a 0331 head that was pulled from an 04 WJ. I am confused because all the searching I've done said the 0331 was redesigned sometime in 02 and should have the TUPY stamp under the oil fill cap. This head does not have the TUPY markings. Was a good 0331 ever cast without the markings? Does this mean the head is one of the heads prone to cracking? Possibly already replaced? Any way to identify the maker of the head if it isn't OEM? There was a pretty comprehensive thread on jeep strokers? I think was the website at least. That thread didn't really get me anywhere and almost made me more confused as to what I have. Just looking for any help or a point in the right direction. Thanks.
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Old May 4th, 2022, 08:51
smokeyyank smokeyyank is offline
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Re: 04 WJ cylinder head question

0331 is the one prone to cracking. 02 was the change over year for the TUPY for the WJ. Someone could have swapped in the 0331 head. A few aftermarket companies have to the 0331 as a rebuild.

For example
https://www.cylinder-heads.com/produ...head-complete/
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Old May 4th, 2022, 17:19
Hexagone Hexagone is offline
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Re: 04 WJ cylinder head question

Yeah at this point I'm just assuming that it is a replacement head that was done at some point in the jeeps life. When I pull my cracked head off I'm going to compare the two and see if there is any noticable differences. At this point though I think I have two boat anchors instead of one.
I was just hoping there was something I missed while researching.
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