Thanks!
If the number is completely stamped, which it is here (and I suspected it was by the cast date) then it was originally a typical 481988 400 block that was machined to accept 4-bolt caps and stamped 9799915 for the SR applications for the parts department.
For the record, an original 9799915 block wasn’t constructed any differently than the typical 9799914. The only difference was 4 bolt main caps.
Can you tell if there are any cast numbers on the main caps on your SR block?
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