I have a 72 with a 350 4bbl and ac. What is a good temp thermostat to use? 160? 180? 195?

 

My choice would be at least the 180, but Id prefer the 195. It depends on how the car is running now. Why do you want to change it? Is it over heating or not heating up enough? If so there are likely other items you need to look at in conjunction with the stat. Accuracy of the temp gauge, radiator condition, clutch fan, hoses, heater core, temp control valve feeding the heater core etc...Whens the last time it was flushed?
Stant makes a cheapo version and an HD version. I prefer the HD version in my Olds.

 

I am replacing the stat because I am in the process of redoing (restoring) my engine and engine bay.

 

Robertshaw 195.

 

Any of them should work. Usually the higher temperatures provide a bit more efficiency; the lower ones offer less chance of fuel percolation and oil breakdown, especially when using low viscosity oils. Oldsmobile only recommended to not exceed the ones rated at 195F. Some engines prefer certain operating temperatures. You could try yours at the different temperatures. The engine may tell you which to choose.

 

My guess is that a lot will also depend on ambient temperature in which the vehicle is driven, too. I'd start with 180. That's what I use on mine, which is only late spring/summer/early fall driven.

 

Everyone always talks about the Oldsmobile motors running "warm". If it is a summer only car and you're using it only on nice days, It'd put a 180 T-Stat in.

I have a 195, and with a new radiatior, good hoses, etc, my cars runs 210-220 all the time. A little more abover 80 for prolonged times, but usually never gets hotter in traffic.

It'd like to see if run a bit cooler, so when I change it, I'll drop it to a 180 T-Stat.