2005 Dodge Ram Rebuilt 5 9 Cummins Blows Frost Plug Step On Hard Wondering

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.