block difference

[vashxj]

hey i have a question that i cant seem to find a good answer to or in the search. What is the difference between all the blocks mainly 96-99 and pre 96?

[SilverXJ]

http://www.jeepstrokers.com/forum/viewt ... ?f=34&t=52

[vashxj]

lol i feel stupid i didnt look in faq, thanks so what blocks would you guys recommend. i would guess 96 and up since they have nvh enhancements and put a pre 96 in a 99 xj?

[Cheromaniac]

so what blocks would you guys recommend. i would guess 96 and up since they have nvh enhancements

Any year 4.0 block would do. I doubt that the NVH reduction in the '96+ blocks really amounted to much, and there aren't any years of 4.0 blocks that you should avoid.

[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.

[vashxj]

ok thats what i thought from model to model they are a little different, i was just wondering because i come across 93 xjs all the time

[SilverXJ]

so what blocks would you guys recommend. i would guess 96 and up since they have nvh enhancements

Any year 4.0 block would do. I doubt that the NVH reduction in the '96+ blocks really amounted to much, and there aren't any years of 4.0 blocks that you should avoid.

x2. I was also told by Lee @ Hesco that they added the girdle mainly to make up for the metal they removed to make it lighter.

[vashxj]

looks like im going to pick up that 93