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Re: 1980 firebird formula coolant leak, frost plug?
Sometimes, ordinary metal frost plugs are replaced with rubber/plastic expansion-type plugs. They are used as a temporary or quick repair for a demaged or leaking frost plug. They don't last forever, though.
Alternately, there are small block drain plugs right beside the oil pan, one on each side of the engine. Usually they are plugged with steel crew-in plugs.
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