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  #1  
Old July 22nd, 2010, 16:09
tugalo tugalo is offline
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0331 HEAD

Which years got the bad head?
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  #2  
Old July 22nd, 2010, 16:11
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birchlakeXJ birchlakeXJ is offline
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Re: 0331 HEAD

2000-2001 had the factory 0331 head. That is the head with the casting defect between cylinders 3-4.

There were some rumors that some very, very late mfg. 99's had this head too, but I have never seen any confirmation of it.
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  #3  
Old July 22nd, 2010, 16:57
joe_peters joe_peters is offline
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Re: 0331 HEAD

Quote:
Originally Posted by birchlakeXJ View Post
2000-2001 had the factory 0331 head. That is the head with the casting defect between cylinders 3-4.

There were some rumors that some very, very late mfg. 99's had this head too, but I have never seen any confirmation of it.
Correct for XJs, but the years for all 4.0s is 00-02, with the new casting "TUPY" 93+, but as Birchlake said, look before you leap 99 and up.
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Old July 22nd, 2010, 20:13
Talyn Talyn is offline
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Re: 0331 HEAD

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Originally Posted by joe_peters View Post
with the new casting "TUPY" 93+,
Sure its a typo, but 03+ for the Tupy head
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Old July 22nd, 2010, 20:17
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SeansBlueXJ SeansBlueXJ is offline
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Re: 0331 HEAD

Its not to say that all the 0331 heads are going to go bad either... just that they are more prone to the issues... I have seen many 0331's going strong for a long time with no issues. But I have also seen them crack at 80k... But I am at 150k and no issues.
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  #6  
Old July 22nd, 2010, 21:59
joe_peters joe_peters is offline
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Re: 0331 HEAD

Quote:
Originally Posted by joe_peters View Post
Correct for XJs, but the years for all 4.0s is 00-02, with the new casting "TUPY" 03+, but as Birchlake said, look before you leap 99 and up.
Fixed.

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Originally Posted by Talyn View Post
Sure its a typo, but 03+ for the Tupy head
I've been having problems all day like that.
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  #7  
Old July 22nd, 2010, 22:04
joe_peters joe_peters is offline
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Re: 0331 HEAD

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Originally Posted by SeansBlueXJ View Post
Its not to say that all the 0331 heads are going to go bad either... just that they are more prone to the issues... I have seen many 0331's going strong for a long time with no issues. But I have also seen them crack at 80k... But I am at 150k and no issues.
Agree, something like 286,000 total production for 00-01, not all would have been 4.0s, and there will never be an actual accounting of all the cracked heads.
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