Hey Gene, I figured you would be the guy in the know on this one. I have read that GM did part a partial vin on Corvette small blocks beginning in 1961, and
for 300hp 327's beginning in 1961. There seems to be a difference of opinion on whether or not this was true for 409" motors beginning in '61-'62.

Any knowledge you could share about this would be greatly appreciated, as always.

Bob