Re: '48 f1 id
My 21 stud 1937 block has some of those random, individual numbers or letters stamped into the top surface. I think those are an inspector's mark, not really communicating anything most of us are interested in, like what day it was built or what vehicle was it installed in.
It looks like you have two broken head studs to contend with, at least they are sticking above the head surface.
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