First of all they are not ( freeze plugs ) they are core plugs. The reason that they are there is for the foundry to get the sand cores out of the block after it is cast.
As an engine rebuilder (machine shop ) I would say replace them. And if you are doing a true out of frame the core plugs and the oil gallery plugs will all be removed and the block cooked in hot tank or at least run thru a jet cabinet .
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Today's Featured Article - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather�s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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