The core plugs are normally a very tight fit, so first i would ensure that the correct plug size is fitted, if you had a compression leak into the block with enough force to blow a core plug, i wold expect hoses to fail as well, and i would expect a misfire as well, normal cooling system pressure would not be enough to pop a plug it self under any circumstances, so ensure correct plugs are installed first.

Answered by mhpautos (expert)
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