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Old January 5th, 2010, 11:54
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mrtosh mrtosh is offline
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'99 cylinder head question

Hey guys I took a bit of a hiatus and went with a wj for a while but am looking to get back in the XJ game again. I'm looking at a 99 classic that has a build date of 08/98 and am wondering what head is on it. I haven't seen it in person so I can't check the casting number. I talked to the guy and he tried to see but said he saw two 3's that's about it. It does still have a regular distributor and such. Do the 0331's only come with coil on plug? I thought the earlier '99's were the 0630? Or is it 06330? Thanks in advance for any info.
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Old January 5th, 2010, 12:30
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Tim_MN Tim_MN is offline
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Re: '99 cylinder head question

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Originally Posted by mrtosh View Post
... It does still have a regular distributor and such. Do the 0331's only come with coil on plug? .....
Spark plug wires makes it an 0630 head. Coil on spark plug rail makes it a 0331 head.
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Old January 5th, 2010, 12:31
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sjx40250 sjx40250 is offline
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Re: '99 cylinder head question

http://www.jeep4.0performance.4mg.com/tech_specs.html
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Old January 5th, 2010, 12:37
KRAKER KRAKER is offline
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Re: '99 cylinder head question

I can't very what's been mentioned earlier. One sure shot way I. Look to verify the dreaded 0331 is precats. Also the smog sticker under the hood. If your XJ is federal most likley not 0331.
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Old January 5th, 2010, 14:12
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winterbeater winterbeater is offline
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Re: '99 cylinder head question

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Originally Posted by KRAKER View Post
I can't very what's been mentioned earlier. One sure shot way I. Look to verify the dreaded 0331 is precats. Also the smog sticker under the hood. If your XJ is federal most likley not 0331.
Not all 0331's have the precats. Do you mean '99s with precats? All 2000/1s have the 0331, FED or CA.

The earlier head was 0630, so if it has two 3's, it must be 0331. My 2000 is cracked.
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Old January 5th, 2010, 15:38
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mrtosh mrtosh is offline
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Re: '99 cylinder head question

He sent me a pic and it does look like the number is in fact an 0331. I don't understand seeing as how it is distributor and has an early build date. There's a guy on jeepsunlimited who has a '99 with a build date of 10/98 and has the 0630 head. I'm assuming maybe this head is no the stock one..
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Old January 5th, 2010, 15:41
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mrtosh mrtosh is offline
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Re: '99 cylinder head question

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Originally Posted by sjx40250 View Post
Its funny you post that. This one is pretty much all the same info except it states the 0331 head starting in 99.
http://www.greatlakes4x4.com/showthread.php?t=661
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