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re: "...I've used a gun ... the factory does too. ...the factory installs cylinder heads, mains, and rods, with air tools...."
That's not really a good argument.
Yes, factory assembly lines certainly use air tools, but each air tool is positioned along the assembly line for specific tasks, and they are each adjusted/calibrated for the proper torque of that specific task.
That is a far cry from an air wrench in a local auto shop, or the air wrench one of us do-it-yourselfers would use, where the one wrench might be used for everything, from lug nuts to head bolts.
And if you don't believe the first paragraph, consider that there are torque specifications, aren't there? Why would a car factory use a common air wrench setting on all the tasks of car assembly and thus ignore the different torque specifications?
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