10 posts - 3 authors - Last post: Feb 4I recall the new head is the 0331 casting, revised to avoid its cracking problems. If $100-200 is a critical issue, you should be able to .

Jun 4, 2011 – Those are the best year range to buy the newer body style xj's (98-99) due to not having the 0331 head problem. The i6 engines last easily .

Feb 7, 2011 – Might be more than a gasket, the 00 XJ had the 0331 head .

5 posts - 5 authors - Last post: Jun 21, 2010need a cylinder head for a 96-99 jeep my wifes 2001 jeep grand cherokee head . Default. yes beware the 0331 head they have problems! .

15 posts - 5 authors - Last post: Jan 18, 2010I did a Alambama Cylinder Heads 0331 Head on my Jeep. Have no problems with it and all fit well. Buy it through quadratec they have them .

0331 head crack, Best! 0331 head, 2 best. 0331 head casting, 3 best. 0331 head problems, (alt.) 0331 head replacement, (alt.) 0331 head grand cherokee .

10 posts - 5 authors - Last post: Aug 15, 2006Gotta replace the notorious 0331 head and I've got to do it before I .

7 posts - 4 authors - Last post: Mar 30, 2007I'm considering sourcing a new, factory replacement head (yes - another 0331 casting, as I don't want the incompatibility issues involved .

23 posts - 10 authors - Last post: Apr 24, 20102000/2001 have cylinder head issues with the 0331 head casting cracking, about 50% will or have cracked. these years also have heat soak .

1 post - 1 author - Last post: Jul 12000 Cherokee Sport, 4.0 I am pretty sure that my head is cracked, and I'm pretty sure that it is the "infamous 0331". The head is the OEM. . My question is: Since it is known that it's a problem head. would it be good .

9 posts - 8 authors - Last post: Jul 2, 2010The '99 and later HO heads with casting no.0331 have smaller exhaust ports to produce . '99 and later cam to compensate for the poorer exhaust port flow of the 0331 head. . . I've got the same problem. but different. .

15 posts - 10 authors - Last post: Apr 9Those are the best year range to buy the newer body style xj's (98-99) due to not having the 0331 head problem. The i6 engines last easily .

Apr 3, 2011 – Of course my Jeep has the crappy 0331 cylinder head and it finally . they fixed this problem in 2002 or 2003, obviously it wasn't in 2002! .

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11 posts - 4 authors - Last post: Jul 16, 2008I just noticed this problem when I got the 4.0 block to rebuild. It had the .

Jan 28, 2011 – I had that exact problem with my XJ. For me it was the notorious cracked 0331 head. I don't know if it could possibly be a cracked gasket .

7 posts - 6 authors - Last post: Oct 15, 2006A 2001 will just be adding the possibility of the same problem on a more expensive XJ (it has the 0331 head). I wouldn't hesitate to spend .

Dec 10, 2010 – Recently I've read a number of threads about the dreaded .

15 posts - 10 authors - Last post: Apr 15, 2010Now I guess the next question is do all 0331's after 2002 have Tupy there . . coolant ports that look like they would give the head gasket problems: . Also, here is a free 0331 head that the owner believes is cracked. .

2 posts - 2 authors - Last post: Jan 24WTB: 0331 Head. . Looking for a used or reman'd 0331 Head, mine finally blew the headgasket . No problems with it, been on 1 year now. .

An 0331 Head Cracked, . Cylinder Head. Crevices On 1999- 2004 Chrysler/Jeep. . .. Contract Problems and Credit ratings Spread Determinants with the . .

View Poll Results: Has your 0331 Head cracked? Cracked Head 47: 28.14%: No Problem 120: 71.86%: Voters: 167. You may not vote on this poll .

Mar 12, 2011 – My newest is a 2002 Wrangler S. forgot to research the .

40 posts - 16 authors - Last post: Jul 13, 2010Advice from Wrangler gurus would be appreicated. Thanks in advance! Google 0331 head. Common problem in the 1999 and newer 4.0 Jeeps. .

3 posts - 2 authors - Last post: Feb 20, 2009Has anyone else had this problem with 00-01 4.0L 0331 heads? I have been having a missing coolent issue for a week or so. .

15 posts - 10 authors - Last post: Apr 9Those are the best year range to buy the newer body style xj's (98-99) due .

May 2, 2009 – About a chronic problem with the 0331 cylinder head cracking. I don't know yet if I'm losing coolant (haven't driven it enough), but the oil .

15 posts - 10 authors - Last post: Apr 15, 2010. ports that look like they would give the head gasket problems: .

9 posts - 7 authors - Last post: Jul 23, 2010The solution is to get a pre-99 head from a junkyard and have it installed, junking the 0331. Other that that I don't know of any issues .

May 14, 2011 – Give us some more details and we might be able to help you .

5 posts - 4 authors - Last post: Jan 11That's a known problem with many of the 0331 head castings that were introduced in the '00 model 4.0L engines. .

15 posts - 6 authors - Last post: Jan 28Loc: Stamford, CT. ^ Yup. As long as it's not overheated, the 0331 head only .

20 posts - 10 authors - Last post: Apr 8, 2006no performance issues at all before replaced the head, did not use casting 0331 but 7160 this time and no issues. There should have been a .

3 posts - 2 authors - Last post: Feb 20, 2009Has anyone else had this problem with 00-01 4.0L 0331 heads? I have been .

7 posts - 5 authors - Last post: Jul 28, 2006The 0331 head may have some problems, but none that DC will admit. A rebuilt can be had for around 300 - 400 dollars if you have a problem. .

10 posts - 5 authors - Last post: Feb 27, 2010Farna, Are u saying the 0331 head flows flows better at low lift only . Even recast to solve the cracking problem is there enough meat in .

15 posts - 10 authors - Last post: Feb 100331 head change results OEM Tech Discussion. . Well the 98 has head issues , either bad head gasket or cracked head, low compression in 3 .

9 posts - 7 authors - Last post: Jul 23, 2010The solution is to get a pre-99 head from a junkyard and have it installed, junking the 0331. Other that that I don't know of any issues .

Jul 21, 2011 – This will help, it will not FIX the HOT SOAK problem. The only known 100% fix for the Jeep . Not the dreaded 0331 head. Makes me so sad! .

I've lost count of the number of 0331 heads that have cracked in the last . the manufacturers actually fixed the head cracking problem sometime in 2001. .

21 posts - 9 authors - Last post: Jun 16What is a 0331 head casting and what problems arose? i have never run across this in all my years on the net. .

9 posts - 7 authors - Last post: Apr 24, 2010I have had three 0331 head'ed engines in my lifetime - one is at 83k miles (no problems), another went to 154k miles (before spinning a rod .

3 posts - 2 authors - Last post: Mar 10Mid 99 to 2002 4.0 engines had issues with the #0331 head casting cracking between the number 3 and 4 combution chambers, but most of them .

39 posts - 28 authors - Last post: Nov 21, 2010That was the first year for the 0331 head which had casting problems which makes them almost always crack and have to be replaced. .

1 post - 1 author - Last post: Dec 3, 20080331 Head cracking problem which ones crack Modified Tech Discussion.

39 posts - 28 authors - Last post: Nov 21, 2010That was the first year for the 0331 head which had casting problems which .

15 posts - 8 authors - Last post: Mar 20i personally swapped my head to a 98 one, was alot easier than finding a . a new water pump and oil pump in. the older head fit with no problems, . . I had the 0331 head in my 01 XJ, and blew the head gasket and never .

4 posts - 3 authors - Last post: Jul 21, 2009So my 2000 Tj has all the symptoms of a cracked head and is starting to have low oil pressure. My question is the damage already done to the .

100+ posts - 16 authors - Last post: Jan 29"qualified Jeep persons" say its a small percentage of owners, in my experience a high percentage have this problem with the 0331 head. .

100+ posts - 46 authors - Last post: Mar 9Early ones also had electrical issues. The last ones had the 0331 head issue, which is only a problem if you neglect the cooling system and .

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