I've kinda wondered why someone hasn't offered a reproduction knuckle head cast in aluminum? It would make the engine run a bit cooler and provide a bit better balance to the bike.
What machining would be necessary to use shovel gaskets and cylinder and get the oiling right up thru the heads and back down to the cases? I'm thinking maybe Axtel cylinders w/ external return lines.
It would need probably custom pushrods / tubes.
Any other thoughts here?