While true, I read a study quite a while ago that showed the stresses were more acute on the crank w/the 7 main arrangement, but a lot less rotational mass.
Take that for what it's worth, I'm not endorsing either as "better" particularly, just puttin' it out there.
Will Burns doesn't seem to have the 4 mains popping out the bottom, and neither does Steve Nitti in His Supercharged 10 sec. Duster, so it's not kryptonite by any means.
