Stamped block numbers below head

In 1974 they were stamped K or 4 for the year '74. I don't think it relative here.
It could very well be, and probably is, an engine re-builder stamp. As many put their own stamping on them to signify it is theirs and to keep track of what belongs to who.


str12-340 said
My understanding is that at some time MP used seasoned blocks to build MP crate engines so the production block was to be expected. What I can't figure out is the K-4 stamped over the number (which is why I couldn't make out the 3 in the sequence)

Thanks for the help!
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