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again, the problem i see is that the thermostat is like a "dam" in the middle of your "river". it separates the upper half from the lower half. you only have access to the upper half. any air trapped in the water jackets of the engine, heater core, etc, will still be there, until you get the thermostat to open.
besides much more even cooling temperatures, this is a very real benefit of drilling the thermostat. you don't have to wait for the thermostat to open. the holes allow a small amount of coolant to pass at all times. it is not without its potential problems though. in extreme climates, you can have slightly lower limits on temperature control. it will take a bit longer for your engine to warm up in extreme cold, and in very extreme hot, the system can saturate.
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