abehuyser

I tried factory thermostat.

Thanks for the quick answers. Really appreciate it. So that's where I was headed with the next question. I don't believe my engine is in the best shape. Getting oily residue on the air filter. Cooling system issues I don't believe it's in the radiator. I think it's in the head. Cooling system doesn't stay at operating temps. 200k miles on the engine. I don't really want to spend a bunch of $ on either rebuild or swap. This is my daily driver and used to play around in the woods. No climbing and none in the future. The gearing I don't honestly know the ratios. Factory as far as I know. Was thinking of just tearing engine down and doing basic rebuild. No stroker. Maybe an updated head and manifolds. What's your guys opinions? I like the throttle body upgrade. Seems fairly inexpensive. Should a updated head be installed? Thanks for the help

So I am new to this forum and the question I am trying to find an answer to is which engine would be the best to use for engine swap. I currently have a 1988 jeep comanche with 4.0 manual 5 speed and 4wd. I would like to have a little more power and gain some mpgs. I was thinking of swapping with the HO 4.0 Which years are these engines available with ease of swapping the engine. I understand there might be some harness changes I may have to make, but wasnt sure if there were a few years of engines that were easier than others. Thanks in advance for the help.