So there's plenty on here about the issues with the 0331 head - what is a suitable replacement head for the suspect 2000-2001 castings? Is a 0331 head from a later year OK - and if so how do you indentify it? What about other Jeep 4.0L heads that will fit without modifications?
thank guys!

 

https://www.alabamacylinderhead.com/...ail.php?id=109

That is a good one to buy new I can't help with identifying others sorry

 

In very late 2002 and from 2003 and newer, Chrysler had the 0331 head redesigned by a foundry in Brazil (TUPY). These heads are fine and won't crack on you.

You can identify these heads by the word TUPY cast into the head between cylinders 3-4.

Do NOT under any circumstances replace your old 0331 head with a used 0331 head, unless you see the word TUPY with your own two eyes.

Other good sources are "clearwatercylinderhead" and "alabamacylinderhead" Shipped to your door for around $500 or so, warranties vary a bit. Call them for information. A recent thread said that Clearwater is out of the heads for the 4.0, but that may have changed by now.