[Dave in MN]

Originally Posted by Bill G

I have a question about the oil return. Is it intentional that the oil return hole is so small?

Bill,
The engine bearing surfaces including the mains, cam and rods are fed oil from an oil passage located between the tappet bosses and the cylinder walls. The crankshaft is drilled to feed the rod bearings. There is likely little if any oil passing through the oil return pipe. The size of the hole shown should be more than adequate to flow any oil passing through or accumulating in the pipe.
The "dipper tray" turns into a "windage tray" as the new rods do not have dippers.

Dave