[Snakebit]

I have tried every 180 thermostat that is made. Moroso, Mr Gasket, Stewart, Stant, and Gates. Drilled holes in the satndard stats and the all ran too cool 170. I finally settled on a 180 Gates Super Stat and the temp holds at a steady 180.

Are you running a bypass hose from the water pump and the intake manifold? I could not regulate the temperature with out one, it ran too cool at speed and over heated sitting at a stop light. After I added the bypass hose, everything was normal. When I changed the coolant, I just filled it up and ran it up to temp. I shut it off, let it sit overnight, and had to add about 8 oz of coolant for the expansion tank to be half full when cold.