Freeze plugs

67Dart273 said
When I overhauled the 440-6 engine way back in the 70's I was told by the shop that it had OVERSIZED CORE PLUGS

You may know, but they are "not" 'freeze plugs'. They have no function other than allowing the factory to cast the block. "Core plugs"

Yeah, but if you look them up on auto parts websites, they're either called freeze plugs or expansion plugs.