Wow! That is amazing. Thank you for sharing. Always wondered how you get a finished product like that. Now imagine it is 1970 and there was no computer controlled machines. All by hand or mechanical vs automated.
The OEM has had machines for over a 100-years built specifically for machining blocks at a fast rate. When you make a million of them a year you can afford to have custom built machines that get it on. Henry Ford had an Ingersoll milling machine in 1912 that could machine multiple blocks at a time. I saw it several years ago in the Henry Ford Museum.