Thanks Frank, that's very helpful.

One question I'd like to also ask here: I'm not getting any blue smoke out the tailpipe, should I replace any head components while it's out? I've heard valve guides are problematic on these engines but don't have any symptoms right now (200k on engine, never been opened up as far as I know).

Grand Canyon State is my home, stock 1991 Montero is my home on wheels.