Oil Pressure
There is also another; rear oil galley plug;
it got left out on a
machine shop cleanup, on a 340 I rebuilt.
I noticed oil pouring down the dist/oil pump shaft area, when using an oil pump primer, with an electric drill.
There is an Outer plug, that has to be removed to access the inner plug.
Sorry, no photo of the inner rear plug.
I made Sure both the oil plugs were in the 318 when I rebuilt it.