This is what I'm going to do.

1. Take the head to a machine shop today to see if he can find anything wrong with or around #2.
2. Edit: I'm going to pull the piston from that cylinder and inspect/change the ring(s).
3. I'm going to put the 4.0L head on instead of the 4.2L.
4. Change the injector to another cylinder far removed from #2 (maybe #4 or #5).

If everything goes well I should be done by this weekend so we'll see what happens then.


Some questions I have.
1. What's the best way to prepare the block for the new head? How to clean it up, etc?

2. I didn't feel any lip at the top of the cylinder that would call for a reamer but there is carbon crusted there. How should I take that off? Should I get the reamer anyway?

3. Regarding the push rods and the new head. What should I do in this situation since the head is totally different and therefore cannot match up "worn" parts.

4. Can I, should I replace only one ring or replace them all?

Thanks for any information.