[skunkwerks]

Originally Posted by Formulabruce

Having dealt Directly with the Gm Authorized "maker" of the stamps in question, and knowing how easy it can be to make a mistake when setting up the device, This all looks fine to me. These union guys at Any assembly plant back then often had Liquid Lunches. Anyone ever see the very Last Super duty Engine stamp from 1974?
The Stamp holder has an edge and usually there is a jig or bracket on engine to align the Vin. With a Jog, the operator had to hold the Jig And the stamp holder, while swinging the Correct hammer, on a Direct hit, to get a "perfect stamp" . Having done a few for SR blocks for Corvettes at the dealership, I can say its Not all super simple.
A simple error of the "Wrong" Hammer can cause a Thread like this 45 years later!!
Stamps holder 3 lbs, EMPTY
Hammer required is a 5 Pound Dead blow ( You can easily see this was NOT used on the very last Super duty)
Jig is 7 oz. used to space off the timing cover

X2^^^^^^^