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Old 03-27-2026, 06:57 PM   #2
Shifty One
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Join Date: Dec 2014
Location: Tucson, AZ
Posts: 970
Re: Engine block drain plug and pet cock install

IIRC, they take a 1/4" hex. As far as pulling them, I'd soak them with your favorite sauce for a while before assaulting them. I like to rap on them a bit with a plastic-faced hammer if they give you problems. Might want to have a small butane torch available on call, just in case.
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