Missed it...Oil Movement

[Old School]

I have been through the manual, perhaps I have missed it but I don't think so. Where or how does the oil flow from the crank to the upper end of the head to the cam shaft area? Even after visually inspecting the engine with the head off I still cannot see anywhere where it might pass through...Well then that said...maybe some forum experience can speak now.

[Water Warrior 2]

The GZ engine does have an oil pump but I don't know about the exact oil flow. There does have to be a way for the oil to be pumped up to lube the head and cam etc.