"Freeze" plug is truly is misnomer.
Correct term is "core" plug. It's there simply to allow the casting sand to be removed from the block after the casting process, no more.
I have NEVER seen a core plug displaced by ice. Only RUST!
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Regards,
"455HO" Lloyd
2008 GMC Sierra Denali 2WD Crew, L92 6L80E, Silver w/ Ebony guts, 14.26 @ 98
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