Just something that I'm curious over. On the drivers side rear of my 250 block there are two tappings. I'm assuming they have never had bolts in them nor have ever held anything there. The years have deteriorated the internal threads ,which I think were once 3/8 NC.Any ideas on what they were cast in the blocks for? Errr I'd post a pic to illustrate this but ???? I don't see how.
