Less than a month and I scored again.

RustyRatRod said

BH castings are supposed to be somewhat thicker and stronger. I don't know anything about "BF" castings. Not that it matters. A free slant six is good no matter what. Nice score.

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I agree but I would still like to know more about the mysterious "BH" and "BF" makings.

I bet the crews who cast these blocks would have never guessed that 50 years later, people would want to know what the markings mean...