Quote: dealerships' were suppose to stamp the VIN on the warranty motors.
I've never seen a shred of evidence to support that story. If anyone has any I'd love to see it (Factory Bullitins, Memo's etc.). It's possible that some dealership owners had internally unique procedures to track engine warranty work but nothing from the factory I've ever seen proof of.
IF it were ever to happen they would have stamped a new block (Warranty/Service replacement, etc.) not re-stamped an old block that already had a number (that block pic you posted appears to have other numbers under the new ones?).
So, first you'd need to establish if the block is a W/S replacement, then have the paperwork supporting that it was actually replaced under warranty at the dealer back in the day, and even then it's still not the original #'s block.
