1940 Chev C15, Cab 11 restoration in Holland

[Lynn Eades]

This is for those us that don't know, but don't want to ask.
These filters are bypass filters, and as such, would have little effect on the oil pressure to the rest of the engine. They are connected on the inlet side to a main pressure gallery. The flow through the filter housing is by way of a restrictor hole or holes, at the inlet to the filter housing (often a small pair of holes in the tube in the centre of the housing)The oil exits these holes,as a minimal flow, passes through the element, and returns to the sump. The bypass filter typically uses a finer media than a full flow system,and has no alternative route when the filter blocks up. (the flow just stops)
Basically you can change the filter. Re-assemble it dry, with the new filter. Run up the engine,(checking for leaks) and then top up your sump.
None of this has anything to do with priming, and starting a rebuilt engine, or full flow filters.