Core plugs, welch plugs, or freeze plugs are used to fill the sand casting core holes found on water-cooled internal combustion engines. == Purpose == Sand cores are used to form the internal cavities when the engine block or cylinder head(s) are cast.
Core plugs, welch plugs, or freeze plugs are used to fill the sand casting core holes found on water-cooled internal combustion engines. == Purpose == Sand cores are used to form the internal cavities when the engine block or cylinder head(s) are cast.
Source: Wikipedia "Core plug" · CC BY-SA 4.0
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