1990 XJ 4.0 swap - compatibility, goodies, etc.

My 1990 XJ's engine has lost compression on #6 (30psi) and my oil pressure isn't what it should be, so it's time for a rebuild. I'm looking for a donor engine so I can still drive my XJ if necessary while I build the new motor.

From what I have found on this forum, any XJ or ZJ engine through 1999 will work with my Renix as long as I retain my flex plate, intake/exhaust manifold, distributor, etc. Is this right?

Since I will be doing the rebuild myself, is there anything I should do (or shouldn't do) while I am at it?

I am considering boring it, aluminum pistons, bumping up the compression, cam, etc. Nothing too radical - just want a little more oomph. This vehicle is basically my daily driver with very little off-road activity. Any suggestions or advice would be appreciated. Thanks!

Time for a stroker.

ParadiseXJ said:

Time for a stroker.

Click to expand...

After doing some reading, I'm now leaning toward a stroker. It looks like it will be easier on my wallet and still give me the gains I'm looking for. Just need to do some more research and find out what all is involved.