The stampings; EUN, engine code, and partial VIN all look like legit Pontiac font and size stamps. The hot wipe of the cast block part number, and subsequent re-stamp makes this block's origin the mystery.
Dealer replacement with upgrade to 4 bolt mains ?
I almost want to get the PHS for the car it was in, to check if the EUN on the block matches the " as built with" EUN on the billing history.
If they are the same, then it would have been a factory substitution
If non matching EUN, then a dealer SR block.
Assuming every block was assigned it's own EUN, whether going into a car on the line, or going into inventory as stock for OTC or SR sales. with the other identifying stamps to be done by the installer.
So OTC blocks may have no code or VIN stamp, but dealer installed would get legit Pontiac font re-stamp? And maybe a hot wipe and a block # re-stamp.
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