Be sure the bolts are in the correct holes. The 2 that have a skinny shank go on the insides of the sprocket end of the cams. If they aren’t thin-shanked, you’ll block the oil passage to the exhaust cam and starve the cam journals of oil.
The oil passage that feeds the top end, comes up through that little brass oil restrictor under the cylinder. That passage goes straight up through the sprocket side cam bearing on the intake cam. There's a passage drilled from the same place in the exhaust cam journal that connects to the other passage.while we one the subject , how does the oil fly to the head in general , like the oil pump pump it Through where?
and how does cam journals get oil under the caps?