Quick Block Question

Cherokee94 · 06-11-2003, 04:47 PM

Quick question. I might look at picking up a 4.0 L6 to rebuild to replace my 165,000 one in my 89 Cherokee (witht he 4.0 in it) but am wondering. What years will fit? I know I can take the accessories from my current one, but are all the blocks the same?

Thanks
Nick

**balloo93** · 06-11-2003, 04:53 PM

I honestly can't remember where I read this, but I want to say the 88-90 were swapable. Then the 91-95 were swapable. Then the 96-98 were swapable.

Again, I can't site any facts and this is just off the top of my head. If it were me, I'd be looking for a 88-89 model to be on the safe side. Hopefully someone who knows for sure will respond.

Fallout · 06-13-2003, 06:39 AM

The blocks are all the same, it's the heads that differ. Rennix M.P.I 87 - 90, 91 - 99 HO, don't know for shure but I think after 99 the coil(s) is mounted directly on the plugs ie no plug wires.
The short block on all the 4.0L's are the same.

**balloo93** · 06-17-2003, 10:01 PM

Aren't the knock sensors loactions different in the older blocks verses the newer blocks?

I had also read a article in JP (recently) that talks about a "Mexican" 4.0 that has a single iron rib and not a dual rib around the bottom of the block on top of the oil pan?

Fallout · 06-18-2003, 06:35 AM

The location of the knock sensor won't make any diff, it's just wire.
As for a Mexican block, thats news to me. Are they OEM?.

**balloo93** · 06-18-2003, 05:19 PM

Supposedly so. There is also semi-confirmed "mexican" ford 289 blocks that are supposed to be stronger (beefier) as well.

I read the articles, but I personally have only seen reg versions of most blocks I see. I'm still passively looking for a block to throw in the garage and rebuild in my spare time. I was more concerned with the old V belt acc bolt patterns lining up with the more current Serpentine belt setup my 93 has.

Also read in either JP or Peterson's that there was suposedly a 94-95 4.0 block with some kind of addition support on the mains?!?