Several years ago I saw TV show about how Chevrolets were built and assembled. The part about the engine line was very good. They showed it from rare materials to the finished product. During assembly the engine they showed was initially timed with #1 at TDC and the distributor points set at the proper gap for that phase of the engine cycle. With the carburetor in place they install each engine on a test stand, this only took a matter of seconds. A flexible hose, like a dryer vent, attached to the carburetor and the engine was started. The hose had the proper mixture of natural gas to test run the engines and have no gasoline hazard for the remainder of assembly line. They monitored the oil pressure, checked for leaks and more precisely set the timing all the while the engine was under load of dyno. This run time was about a minute there was no coolant used on the test stand. Although not ideal that was the process shown at the time. I'm sure the good old zinc content of the oil used along with EOS worked fine for 99% of the application.
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