core 'revision' number...BS? BUSTED!!

Krooser said

That - number is simply to identify how many pours were mede in a single mold. As the old deteriorates they can identify the cores that are likely bad and send them to the scrap pile to be remelted and reused.

I have two sons who have foundry experience.

Click to expand...

If you have son’s with foundry experience, perhaps you should run what you wrote by them. As it makes absolutely zero sense.
The sand cores used in gray iron green sand casting, used in producing the 340 v8 blocks that are under discussion here are one time use only. The single digit numbers under discussion, the numbers on the outside of the casting are Pattern Numbers.