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If you are referring to plugs in the engine block, sometimes called freeze plugs, they are used to remove sand from the casting when the engine block is cast. They are not freeze plugs and serve no purpose after manufacture.
Wiki User
∙ 19y ago
Wiki User
∙ 13y agoA core plug (freeze plug) is used to seal the holes around the block that were required to remove the casting sand when the block was made. The idea that the plugs will prevent a cracked block if the coolant freezes does not work.
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