Question about which 4.0 head to use?
I have an '83 CJ7 with the 4.0 head conversion. Long story, but I need to replace the cylinder head (with another 4.0) and I'm going to source one from the local yard.
My question is simply this: I want to get a low-mileage part, which probably means getting the latest year that's compatible with my 258 CJ block.
Can I pull any cylinder head from an I-6, say a Grand Cherokee, or is there a certain range of years and/or models that I should look for, can't/shouldn't use, etc.?
I know the 7120 is supposed to be the best casting number for this purpose; does that have to come from a 91-95 Wrangler or did it (or an equivalent) go through other years and models?
1983-91-94 CJ-7 Daily Driver
258 w/4.0 Head Conversion & MPFI
YJ OME Spring Conversion
YJ Interior, Metal Doors, Hard Top