I will be doing a 4.2 to 4.0 swap on my 89 YJ,
Would like to refresh the engine w/o a complete rebuild.
This is what I have so far.
92 4.0 out of a YJ, computer harness ETC, PO claimed only 148k on it.
New parts I have Purchased over the last 2 months.
Valve cover gasket
Timing chain kit, which includes gears, cover, gasket and damper
rear main seal
Spark plugs, wires, cap, rotor & coil
new head bolts
POR 15 engine paint
intake temp sensor
That's all I can think of off the top of my head,,,
Anything else I should be changing out? inspecting?