Engine question

[Jesse714]

I am going to be re-building my motor here pretty soon, instead of buying an HO block and rebuilding it, could i just pull the head at my junkyard, have it remachine and whatever else it is they do, and throw that on my freshly rebuilt block? Then i would have the High output right? Does anything differ on the renix block? And will the head off of a 91+ fit on my 89 XJ? I was thinking that the blocks would both be the same, and i wouldn't see any more performance if i had to get the whole engine, as they are both 4.0L, unless there is something better about the block also?
Thanks guys

 

[88 Wagonman]

This has been covered many times, try searching for answers.
The head is a little different from renix to HO, the ports for the manifolds don't line up, etc. There is a lot of info out there that you should be aware of. That being said, I have a 98 block\head in my renix rig, but it took some work to do it right. Use this link to aid in your searching: http://www.naxja.org/forum/showthread.php?t=80053

 

[Jesse714]

Thanks for the link, I was already planning on pulling both manifold for my donor jeep for the head, what i mean't was will the head fit on my block?
I'll take a look at the other thread and let you know if i have any questions.
Thanks 88

 

[cruiser54]

The head will fit your block. Your Renix intake will match up if you port the intake ports to the Renix gasket.