cowl stampings???

[L89DRMR]

I parted out a 1969 L-78 a few years ago and a line worker had written X66M21 in huge letters and numbers on the right-hand firewall. The car was rusted beyond saving and this writing was also converted over the years into rust as well and you had to look hard to be able to read it. Dave

[Kurt S]

I think Jeff must be right, they really didn't mean stampings. Stampings would be too small to see.
Most of the firewall writing is actually between paint layers since the colors / option writing were for Fisher Body. They are generally only visible when the firewall is being stripped. The rotation / sequence # was on the top coat of paint since it was used in the assembly process.

[x44d80]

My car had N10 chaulked on the driver side firewall just below the X stamped part in the sheetmetal. It became visable as I was blasting off the black paint so it was on the bare metal. I've heard from someone else that a ZL-1 car had zl1 chaulked in crayon on the fender extensions. Ed could probably verify this better than me because on that my info is 2nd hand.