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Identifying a block and the 0331 head

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Old 08-22-2012, 03:50 PM
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Default Identifying a block and the 0331 head
Is the 0331 head a high output, or is it a regular head? Also how can i identify the block to know what year its from?
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Old 08-22-2012, 04:27 PM
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00-01 have these heads. I don't believe any older XJ's did.
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Old 08-22-2012, 05:32 PM
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Get the number off the driver's side of the block.
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Old 08-22-2012, 08:49 PM
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i found out the block is from a renix era xj. is the head still a high output? because i a going to build a stroker and wanted the HO head and intake manifold
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Old 08-22-2012, 08:53 PM
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0331 heads are prone to cracking between the #3 and #4 cylinder.
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Old 08-22-2012, 08:54 PM
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all I6 heads are prone to cracking. just some more than others lol
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Old 08-22-2012, 09:28 PM
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Originally Posted by 88_cherokee
all I6 heads are prone to cracking. just some more than others lol
Not true at all.
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Old 08-22-2012, 09:29 PM
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Originally Posted by 88_cherokee
i found out the block is from a renix era xj. is the head still a high output? because i a going to build a stroker and wanted the HO head and intake manifold
Get the number off the head. Driver's side about 1/2 way down.
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Old 08-23-2012, 05:37 AM
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Originally Posted by cruiser54
Not true at all.
Agree with cruiser54 that not all I6 heads are prone to cracking.

Actually the heads from 87-99 are quite hardy.

It's the 00-01 that you need to keep your eye on because of the casting defect between cylinders 3-4.
Last edited by tjwalker; 08-23-2012 at 05:39 AM.
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Old 08-23-2012, 08:03 PM
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Originally Posted by cruiser54
Not true at all.
the guy down at the machine shop has seen cracked heads from all years and so did the engine i just bought, 88-90 block with a 2004 head cause the old head cracked
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Old 08-23-2012, 08:05 PM
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from the reasearch i did, the head i have appears to be the revised 0331 that has "TUPY" stamped on in
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Old 08-23-2012, 09:40 PM
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Originally Posted by 88_cherokee
the guy down at the machine shop has seen cracked heads from all years and so did the engine i just bought, 88-90 block with a 2004 head cause the old head cracked
Machinist is mistaken.
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Old 08-24-2012, 12:50 AM
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clearwater cylinder heads makes the aftermarket 0331 head i just bought. it is beefed up in the 3-4 clack prone areas.
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Old 08-25-2012, 07:24 PM
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the head i have is a "revised" 0331. anyways, found a crank and hope to buy it tomorrow
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Old 08-25-2012, 09:38 PM
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Is crack between valve seats?
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