FWIW, the LS based engines run better with a 180* or 190* t-stat than a 160* t-stat. It would run slightly cooler with 160* but just because it will make it run cooler doesn't mean it is good for the engine and cooling system.
160 is too low. Hell the switching point between open and closed loop is 155*F. You may end up switching between open and closed loop which will ruin gas mileage. The lowest you would want to go is 170. I have a 170 but am also chipped for it aswell. I like it cause it keeps the tranny temps down too.
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