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I think the condition of the two engines and drivetrains would be the deciding factor for me. I'd do a Bona Fide compression and leakdown test on both engines and after considering mileage oil pressure and vehicle histories, decide which one to use. I would even consider using both engines and building a stroker (putting the 4.2 crank and rods in the 4.0 block). I also recommend the site CSP posted for more info. All you need to know is in the archives so you don't even have to post there (not that there's anything wrong with that!) if you are good at searching. Good luck. <img src="/forums/images/graemlins/cheers.gif" alt="" />

I agree i would also like to say another option is to do a head conversion(putting the 4.0 head and fuel inj on the 4.2).Which i did would depend on which block was better(less wear,not cracked and so on)

out of all the jeeps in this town the d**n gremlin had to invade mine

I've done so much,with so little for so long i can practicly do anything with nothing