besides the pucks, there is another more insidious potential point of leakage. The outboard, forward studs that hold down the cam bearing caps are screwed into holes that are open to the atmosphere, at the midpoint of the cylinder fins, if the stud wasn't there. If that stud had ever been removed, as they sometimes are in a rebuild, whatever replaces them may leak through those threaded holes and drip into the cylinder head fins at about the mid-point, half way up from the head gasket and halfway down from the cam cover gasket.
I had removed my studs and from many cam swaps had stripped these holes out, used 1/4-20s for a while, then helicoils to repair the threads. They leaked like sieves. Never could seal them up. But probably didn't try hard enough. Early on I should have replaced the studs using an industrial quality thread sealer.
If you clean the head thouroughly, then poof some talcom powder in there, with the bike on the centerstand running, you should be able to see the leaks with a CSI style flashlight (or any light really, CSI is cool). If from those threaded holes, you'll actually see the oil drip from those holes. You'd think that smashing the cam tower down on the head it would be enough. But its not, the hot oil will wick its way under the towers, hence the pucks, and if they are OK, the stud holes are leaking.
