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I assume that you have an early 4.0L YJ or Cherokee and want to put the newer 4.0 HO head on it. I have heard lots of people swapping the the 4.0 head onto the 4.2 Jeep, but have not heard of many 4.0 to 4.0 swaps.

I have a 4.2 with the 4.2 head, so I am not help. I did search google for the 4.0 to 4.0 HO head swap, and really did not find much.

I did find some information about the different 4.0 motors and intake manifold differences and years to stay away from because of emissions changes, but nothing on a 4.0 to 4.0 head swap.

All I can say, is spend some time searching. I'm sure that someone has already done it.

-- mike
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