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Discussion Starter · #1 ·
Are the heads for all 4.0l motors in the same year interchangeable? For instance would a 2000 4.0l from a cherokee fit the TJ motor.
 

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Yes but that year is plagued with the problem you likely have, which is a copper deficiency, making it more likely to crack the head, if you were going to swap a different head on you'd be better served going with an 03+ or looking up how to use an older head. The first high output heads from 91-95 have the best flow numbers if you port and polish them. It's not just a drop and go however since the older heads (even up to 99) had a distributor and you have coil on plug you have to modify it for your application
 

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Discussion Starter · #4 ·
Thanks. I know about the bad heads. A lot of info out there. I have a stuck intake valve, probably caused by the infamous crack
 
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