Quote:
Originally Posted by nonstop
Don’t make the mistake of going to the 165 thermostat. Once it opens, it is open until the engine cools back down below 165 degrees. Past 165 degrees It won’t really regulate flow and will be fully open. You are running a 180 thermostat with 3 holes drilled in it (what size?). It is just as or even more important to restrict the flow and keep it in the radiator as it is to let the coolant flow. The more holes allow more unregulated flow which makes it harder for the thermostat to keep up with.
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There are 3 the size of the head of a ball point pen