There was a story on the NOC Forum that thats how the factory used to do it !
The NOC Forum has been rejigged so many times that unfortunately the links can no longer find anything.
There was also an account there that the crank balancing in the AMC era was done by a contractor, and he just drilled
all cranks to roughly the same set of (random ?) holes in the crank, regardless of the actual weights of components.
Which is fine if all components were identical, and the initial balance was what was required to be mass copied.... ?
Having a lot of end float is said to flog the oil pump drive gear(s) more than is desirable ?
Closing the throttle unloads the contact pressure on those worm gears..
That’s certainly what the â€œhome mechanicâ€ used to do.
Doesn't the story go that Nortons assembled the bottom ends without any shims,
they just assumed the parts were within spec?