[rotorwrench]

That is the standard flathead diagram in that older thread linked on the previous post 3. Oil feeds the rear main first then feeds valve chamber passage with a Y for filter. All of the cam & front two main bearings are fed from the valve chamber tube. The oil filter has a restrictor to provide control of overall system pressure then after the filter, it just drains back to the oil pan as in the wonderful pictures on that thread.

Kerby