4.0 Block Interchange Between Years Of Xj And Grand Cherokee

[sinkrun]

First question, I have heard that the Grand Cherokee 4.0`s had different blocks (mounting lugs for the accessories) than a XJ 4.0 block. Any one know what year blocks will interchange with what? I know the heads are different and can be interchanged with a adapter plate.

Second question, I have a 96 XJ block I want to rebuild and put in my 2000 XJ the head is already on the 2000 from the 96. They look the same to me however I have a guy telling me no way.

[onlyinajeep726]

Courtesy of cruiser54:
 

XJ Cherokee and ZJ Grand Cherokee 4.0L engine blocks interchange.

2000+ TJ Wrangler and WJ Grand Cherokee 4.0L engine blocks interchange.

XJ/ZJ blocks and 2000+ TJ/WJ blocks do not interchange without significant modifications. (1997-1999 4.0L TJ Wrangler blocks will interchange in XJ/ZJ and visa-versa).

TJ/WJ 4.0L Engine blocks underwent clean sheet design changes effective in the 1999 WJ Grand and 2000 TJ Wrangler. These blocks are not interchangeable with XJ/ZJ engine blocks. The reason is motor mount bolt holes and belt driven accessory mounting bolt holes are in different locations, or not present at all, TJ/WJ vs. XJ/ZJ.

http://www.jeepforum.com/forum/f11/4-0-engine-compatibility-1405083/#post14017944