Like QuickSilver explained, it's really determined by how efficient the cooling system is. The thermostat just sets the minimum temp the engine will run, but you need to have a capable cooling system to see it.
If you run a 160 stat and the cooling system is subpar, then it will still heat up to a point where the cooling system can eventually maintain it, and that can be virtually any temp above the thermostat rating.
If you have a really good cooling system it'll maintain any low temp thermostat you put in there.
Removing the thermostat doesn't necessarily mean the engine will run cold, if the cooling system isn't that great to begin with.
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2019 Pontiac Heaven class winner
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