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I use Stant 160's. The engine runs at 175 degrees anyway; maybe 180 going up a steep hill. I hold the stats in-place with a one-inch high piece of cut radiator hose .... one-size smaller than the actual radiator hose itself. Filler does not inhibit water flow .... its the same inside and outside diameter as the cast iron head outlet on which the stat sits. Little rubber cement holds the rubber filler ring in place; no drilling needed; easy to change stats if needed.