Quote:
Originally Posted by Rich69shortfleet
Necessary? No. Helpful? Yes. It allows the engine and radiator to be completely filled with no air pockets being trapped. Drilling one or or two 1/8" holes in a thermostat creates no issues or fluctuating temps that I've ever seen. Many thermostats nowadays come with holes already in them....
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$10 says the PO's thermostat has a little notch in the seat to let air through. If such is the case, no holes necessary.