Very interesting video. As a mechanical and manufacturing engineer, I found the machinery to be more advanced than I would have expected in that period of time. Thanks for posting, Jack...
Are you kidding me

I am not doubting your statement but I was shocked at the amount of dirt and such at the assemblies areas. The modern repair shop is much cleaner than that and the Factories are usually spotless. Then to hear you say it was expected is just really surprising. Its just hard to believe with that much dirt that things ran at all. I got a big kick when they started them up.
BTW there was no head gasket since there was no removable head and the case halves may not really need to be sealed since leaking oil was not really an issue.