Head question

[tireroastin93XJ]

I've read it somewhere here before, but I can't remember. Did a search and couldn't find what I was looking for. I'm thinking of trading my 93 XJ for a newer one. I know that 97/98's have a head cracking problem, but what about 00/01's? Is it just the two years or is it from 97 up? If it is, I'll just keep my 93. Thanks.
Mike Harris

[RichP]

HUH, Head cracking problem, nope, exhaust manifold cracking problem yes.

[Dr. Dyno]

The WJ 4.0 heads with casting no. 0331 were also used in the XJ from '00 onwards and these have a reputation for cracking in the middle if the engine overheats. The earlier HO heads with casting nos. 7120 and 0630 are not crack-prone, but the pre-'00 exhaust manifolds are known to crack where the secondary pipes join the collector.

[tireroastin93XJ]

HUH, Head cracking problem, nope, exhaust manifold cracking problem yes.
Well, I know I found several posts with 97/98's with cracked heads right under the oil filler cap and a few people said they were prone to cracking. I think the replacement head has an X on it about the same place where it cracks but I can't remember. I'd hate to buy a newer one and have the head crack on me.

Mike Harris