The Stovebolt Site Forums The Shop Area Engine Shop Chevy 235 Block Numbers.

I was told that when a replacement engine was issued,
GM would send the mechanic a stamping die set to transfer the original engine serial numbers to the new replacement engine.
When done, the mechanic would send the stamping die set back to GM Headquarters.

Gang stamp

Date Stamp Characters scroll down for Gang stamp.

Assembly line stamping scroll 4 pics