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**CT99XJ** · 06-22-2010, 08:34 PM

The GC's were much more advanced with stuff than the Cherokee. XJ's stayed the same (barring minor changes) from 1987 until Wolfgang in his infinite wisdom gave it the axe. The 99 GC was the first year of the WJ chassis designation, and generally with Jeep, the first year will always be an oddball.

5-90 · 06-23-2010, 04:33 AM

Quote:

Originally Posted by jeepgod

Crap, thats right, sorry for the brain fart. You can only swap the heads if they both have a distributor or if both do not have a distributor.

Yeah, that was the year they were transitioning to the new block that was distributorless and they were just using parts that were left over fromt he distributor ones until they basically ran out....that is what a friend of mine who works at the Chrystler test plant said.

Not so!

The heads will swap mechanically, so they'll bolt right up to the block (the 258 and 242ci heads, 1975 and later, use the same screw pattern and can use much the same gasket.)

Yes, the 0331 head (1999-2006) will have the coil rail bosses that the previous heads will not. However, this isn't insurmountable - either you go ahead and use the 0331 head with the distributor block, or you make brackets to retain the coil rail that attach to the valve cover screws to use the earlier heads on the later engines.

NB: If you swap in a 0331 head, make sure it has a "TUPY" casting - these are the heads that are made properly, and should not crack up top between the #3 and #4 cylinders.

wjonthemove · 07-25-2010, 03:13 PM

hey jeepgod....so the 4.0 blocks all the same?? i got a 01 larado 4x4... i know the heads are different. just need a block, one of my piston skirts cracked and has loud knocking.. i found some good priced blocks 4 under 300...

jeepgod · 07-25-2010, 03:26 PM

No, not all the blocks are the same either, some of the trans mounts I think may be different as well as engine mounts. Do your research first by calling a local junk yard or dealer to find which years and models will swap. I used to know which years and stuff will swap but have forgotten, but it is easy to find out. Yeah, don't be suckered into believing that they are the same by anyone because you will get burned.