OK, so I admit it. Dave's comments really piqued my interest, so I did took some measurements on my V11 and since I have a G5 block in my basement, I took a look at that as well.
From a back of the envelope calculation using numbers posted above, and from just looking at the V11S dispstick in the G5 block (they're really close to the same, if not the same), the oil level in the V11S, when full, is about at the upper gasket. Fine, that's been said before, and now I believe it.
The oil level on older bikes is about 20 mm higher..or the oil level on the broad sump motor is about 20 mm lower. The distance from the bottom of the crankshaft lobe and the top of the oil is about 60 mm on the V11S motor and about 40 mm on the older models. This ASSUMES that the V11S and G5 crankshafts have the same diameter lobes. This explains why I was remembering 3" (7.5 cm) and Ratchet measured 6" (16 cm).
At this point, Pete and Greg are but were're all having fun pushing our pencils around here at the Group W bench.
So, this brings up the next ignorant question- why not just fill the crankase up with another 20 mm of oil (a quart?)? Sure, it'd be closer to the crankshaft, but still 40 mm away.
J
Dammit, Pete just added that while I was typing and measuring and bears, oh my. Thanks Pete, that answers my question- too much pressure build-up.