Have to agree with the GM LS swap or stroker.

Or you could just go all out and do an LS V12.

http://ls1tech.com/forums/conversion...ls1-build.html

 

ford "mod" motors are huge... i don't think the xj has the underhood room for one.

 

Its not that theyre big (tall), theyre just wide (a little over 90 degrees) to allow for low hood clearance. The 4.9 is only 281 cubic inches compared to your 4.0 which is 242 cubic inches.

 

I know, i don't believe they fit in a fox mustang without mods to the shock towers in the front.

 

Yup. Didnt matter if they were Romeo or Winsor, baby still had a wide ***. Lol

 

5.3 swap all the way!!! more HP than a stroker in stock form. more reliable than a stroker. can be run on 87 octane easy. more mpg. 60 lbs lighter,

i went between stroker and 5.3l swap for a long time but in the long run i know id be happier with the gm v8 thats still being produced.

 

Any difference performance and sound wise ?

 

Been down this road before...
I did the whole stroker thing....never again.

My stock 5.3L puts out more power and cost a hell of a lot less than my stroker build.

And finally.....There's no replacement for displacement.

 

Mine has 275K & is still going strong. You should be good.

 

How much did it cost you?

 

For the size of the mod motor you can have a 460 which makes a lot more power but weights a lot more.The easiest v8 swap will be a small block chevy or ls family anything else you gotta make everything on your own.

 

I'm an lsx fanboy for sure. however, since this is a jeep I'd opt for a gm atlas engine. I think it would make engine mounting, exhaust routing, and hood clearance non issues. yet still offer the same tune ability and nearly the same power as a 5.3.

 

SeriousOffroad did the GM V8 swap to his. Came out great.

 

I'm not 100% but I think a AMC 360 bolts right up to the jeep transmission. U could build a torque 360 for the price of getting the Chevy motor and granny and transfer case and new driveshafts. But I might be incorrect but I have read in a couple places that it will bolt up.

 

The AMC 360 was even offered with a TH400 trans in some model Jeeps so if Chevy parts is your thing, this is an option.