[scottj]

For an application like the Cobra, where the radiator is not the highest point in the system, you have to use a surge tank. The surge tank is mounted at the highest point of the system, with the radiator cap on top. Use a 1/2" line to connect the bottom of the surge tank to the inlet side of the water pump. Connect a ¼” line from the side of the surge tank to the highest point of the low pressure side of the radiator. The ¼” bleed line allows for a small amount of circulation through the tank. As coolant flows through it, the surge tank allows air to separate from the coolant. Any air in the system will be forced out if system pressure exceeds the cap's rating. What you don’t want to do is run the cap in the hose on the high pressure side of the system. Running the cap in the upper hose will allow water pump pressure, not total system pressure, to force coolant out the cap at high rpm. When that happens the boiling point of the system is immediately reduce.
Scott