If it is a twincam leaking (sorry, I'm late coming in on this one), a buddy that has an "American Motorcycle Shop" had a Road King suffer an oil failure on the scavenge side, so the engine would fill up with oil... while it was running.
It seems the cause of his casualty was a piece of the inside of the case would occasionally clog the scavenge port. The piece came from a blowout caused when the Factory drove in the alternator bolts with too much loctite, and hydraulically popped the bottom of the hole into the case.
Things came to a head (if you'll excuse the expression) when, on a roadtrip, he topped off the oil bag (down about a pint) and then took off. When that additional pint got trapped in the case, he started getting a hydlock under the pistons. He said in thirty years of riding Harleys he has never heard that kind of noise!