Strange 512 Block
Just looked at a very odd Jan/69 cast 3963512 4-bolt block that the last 3 digits "512" of the casting number are stamped on the flat area where someone ground it down smooth. The 3963 are undisturbed, as cast. Where motor is sitting today it has not been disturbed for over 20 years. I can't figure what this would be or why it was done. Block looks usual in all other respects. It must be a 512 as no other similar block cast number begins 3963 as far as I know. Can't get photo right now but based on my description does anybody have an explanation ?
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