[Snakebit]

OK. If I let the car sit and idle the temp goes to 180-200. If I drive the car at 50mph and the temp does not go any higher than 140. I blocked off about 1/3 of the radiator with a piece of cardboard and it stays at 160. March street pulleys: crank pulley is 5 1/2" water pump is 5". Under drive water pump pulley would be 6". The robert Shaw thermostat has (3) 1/16 holes drilled in it. The thermostat should be closed at 140, so how is the engine staying at 140? There should be some fluxuation if the thermostat is opening and closing.