I worked in the Fremont assembly factory filling in for absent people. One day I had the job of driving the car out to the lot.
At the end of the assembly line, the car was started and idled for maybe 4-5(?) minutes on a moving conveyor with various checks being done.. At the end of that rolling conveyor, someone drove it a short distance, maybe 100 feet, and put it through a hard brake. Then I got in and drove it to the lot for loading onto transport or train. This was in the late 70s. Not all cars started of course.
I assume that those few hundred feet of idle, plus the 100 foot drive, plus my drive out to the lot was it until it was driven onto the transport truck or train and a few minutes at the dealer. Maybe the plant where the engine was assembled ran it? I'd guess about 10-15 minutes total run timebefore the customer drives off.
The low lift cam lobe design, spring pressures, and maybe high quality lifters might be why a real 'break-in' wasn't needed. Dinosaur oil right out of the ground was probably good enough combined with assembly lube.
That whole area was at the opposite end of the plant from my normal area, maybe 1/2 mile or more. I still 30+ years later occasionally have strange dreams about how big the plant was where I get lost looking for the cafeteria or a restroom. Never really got lost.
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