Even if you are using a coupler tool and transfering all that torque thru the crank assembly, it's still only 80 ft/lbs which is nothing compared to a running stocker, much less a built engine.
Answer this, when tightening the flywheel bolt, where is the most stress put? The bolt shoulders contact the flywheel and draws the flywheel and crank together, the rotational force is between the face of the flywheel and the bolt shoulder itself. Hold the flywheel from rotating and the only force applied to the crank (and taper) should be the draw into the hub.
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I was just arguing why I think the "rope in the cylinder = bad" idea is BS. I am sure the keyway, flywheel, etc. are strong enough I just think the connecting rods are stronger.