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I use chrome pipes between the head and radiator. The tube inside the short hose connecting to the head keeps the thermostat in place.
I saw the temperature go to hot (the top mark on the gauge is about 200 degrees) first, and then drop to the thermostat temp. With the water flow blocked by the closed thermostat, the water at the sensor had to get to 200 before the water temperature up in the neck of the head gets hot enough to open the thermostat. I drilled two 5/32" holes hear the edge of each thermostat to let some flow past the bi-metal thermostat mechanism. Now the temp comes up to the thermostat temp without any overshoot.