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Old 05-19-2016, 01:47 PM   #10
Bigdav160
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Join Date: Apr 2011
Location: Klein Texas
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Re: did i crack my block

+1 on what Mike said. They are called core plugs or welch plugs. They fill the opening that casting sand is removed from.

They are nicknamed "freeze plugs" because they tend to pop out if the coolant freezes. the expansion that pushed the plug out usually pushes in and cracks the block.

Yep, watch for water in the oil.
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