I assume that number (B44845) is on the right side of the head. That's probably two separate numbers cast close together. B44 would be the casting date code. The actual head casting number should be on top of the head on the left side, next to the valve cover flange.
Curt
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1953 Chevy 6400, 1957 Chevy 2dr Sedan
--"Mediocrity is easy, the good things take time"
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