Actually the AMC 2.5 (Not the Iron Duke) has the same bolt pattern as the GM 2.5 four cylinder and the 60 degree V6's (2.8 3.1 and 3.4 liter) The only thing that make the AMC 4 cylinder an AMC engine is the fact that they stuck a Ford computer and ignition module on it, It IS the GM block. Even the Chrysler made engines are the same bolt pattern. The 4.0's on the other hand are not a good swap due the the amount of body mods that need to be done, and that your need to have the AX15 Transmission which is a completely different bolt pattern. On 87 and later XJ's it's possible but incredibally difficult and would be easier just to buy a 4.0 XJ. Why? because they had to move the whole radiator and condensor core for the AC into the front grill area. The only poroblem I could see with a V6 in any of the newer Jeeps is if the dimple on the firewall where the fire wall rolls back into the transmission tunnel on the passenger side is still there. This was to accomodate the v6 Y exhaust pipe. If you like I can get a photo of this so you can see for yourself.
1984 Jeep cherokee
1986 Fiero GT v6 engine
Last edited by errorinspelling; 07-30-2002 at 04:56 PM..