So imagine trying to spin the mandrel with it only supported with one 1-1/2" wide bearing surface.
You make it sound like
line boring is a rare and dangerous feat. It's done all the time.
Line boring is done everday with no problem. You keep confusing your terminology and thinking
line boring and
align honing are the same thing and they are two completely different processes altogether. No body has ever disputed whether or not a Stovebolt can be line bored or not. Align honing
cannot be performed on blocks that have different size housing bores like the Stovebolt, GMC Jimmy, Straight 8 Buick, Pontiac and many other engine blocks.
Line boring can be performed very easily on blocks that have different size housing bores, and is the only way that they can be machined to correct out of spec housing bores.
Line boring and
Align honing are two completely different machining operations done with completely different equipment and objectives. Its like people that think knurling valve guides is the same thing as honing them to size.