To all FE owners. Please DO NOT run anything less than a 185-degree thermostat, expecially if you have a functioning
oil cooler. Want proof? Run your engine with a 165-degree thermostat for a while, then pull the valve cover breather out. Probably looks like a chocolate milkshake around the bottom of the breather. I had nighmares after looking at that.
The thermostat does not have anything to do with engine cooling, only engine warmup.
Sorry for the lecture, but seeing that gunk was a life-altering experience.
Brian