• NAXJA is having its 18th annual March Membership Drive!!!
    Everyone who joins or renews during March will be entered into a drawing!
    More Information - Join/Renew
  • Welcome to the new NAXJA Forum! If your password does not work, please use "Forgot your password?" link on the log-in page. Please feel free to reach out to [email protected] if we can provide any assistance.

04 WJ cylinder head question

Hexagone

NAXJA Forum User
Location
Idaho
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.
 
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.
 
Back
Top