Slow, Driving Rustoration 1972 Dart

BrianT said

I beg to differ. YES, they are called freeze plugs. I've worked on cars for almost fifty years and I've never heard anyone refer to them as core plugs. Maybe it's a regional thing? I get how the holes were made, but I find it interesting that it popped loose when it was -4 degrees last week also.

Not looking to argue. You stated your opinion and I stated mine.

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Nope. Core plugs. Not regional nomenclature either. Ask any professional machinest what they are called. Not joe blow at the around the corner garage. I looked up core plug on the internet. 3 screen shots in about 30 seconds. They may pop out in negative temps, but that's not what they are designed to do. If they are starting to corrode, sure a frozen block will pop them out, but more than likely if they are new and tight, the block will crack before they pop. They are not a fail safe for a frozen block. I bought a charger with a rebuilt 440 that the idiot left water in over the winter. None of the brass "core plugs" popped, the lifter valley was loaded with cracks in the water jacketed areas above the lifters on both sides with rust weeping out of the cracks.