Here is a shot of Crane's rocker setup disassembled
http://www.cranecams.com/images/down...%20347901).jpg -- it's not Erson but it will help you visualize how the
oil travels to the valve train components. Different vendors will provide different levels of head work. "Right out of the box" I don't believe any of the return oils are even touched; certainly not Edelbrock, maybe the new BT MR heads, but I have yet to see them "in real life." Here are some shots of those heads (port sides mostly)
http://www.network54.com/Forum/74182...u+have+dial+up...... The BT heads look pretty awesome.