look closely at the pic in the lower right corner. that's to one head. when the cam passage rotates around to the bottom it sends oil to the other head. this takes oil away to the #4 main and to the #7&6 rods also. that is way they will starve at high rpm. if you look at the pic in the middle it shows one head being feed by the #2 cam bearing and this is WRONG. they are BOTH feed from the #4 cam journal on bb.
