Brian71583

My XJ is an '01. I bought it with slightly blown head gasket and used the stuff in a bottle and it worked great.

Eventually I plan on doing it right and replacing the head since its probobly the bad casting and not just the gasket. Maybe even throw in another 4.0 if I can find a deal

I was told by someone to look for an '03 head. Would an '03 motor drop right in with no mod. I don't know If the other models have stuff in other locations.

If I just stick with the head only is an '03 the best choice for casting and distributorless, etc?

ol'DixieJeep

youll need a 0331 head. just take the head to a machine shop and have em freshen it up and replace the gasket... easy as that. could also be cracked. you can have em repaired.

UN150N

If your going to replace the gasket just get rid of the 0331 head ... In 03 they re did the 0331 casting it will say TUPY or TUFY I don't remember that head is a direct replacement.. But you can do the 0630 head casting with a few mods.. Brackets for the coil rail and the exhaust ports are different so you need a adapter plate or a aftermarket header

ol'DixieJeep

the 0331 head isnt bad... some crack but the others do too. as long as you dont run it when over heated itll be fine. im interested in this 03 head though... i like my coilpacks, and im pretty sure theres more than just a few things to change to the older style one.

UN150N

I have a 0630 in my 2001 and all I did was make a few brackets to hold the coil rail in place and I did a adapter plate for the headers..

ol'DixieJeep

i meant itd be hard to change to the distributor system...

UN150N

You don't change to the distributor system... The distributor is in the block not the head but the coil rail bolts to the head so if you use a older head (0630) there is no holes in the head for the bolts that hold the coil rail in place so you have to make brackets that go from the studs on the passenger side of the valve cover to the coil rail to hold it in place