Rear main cap

[V12Bill]

On the rear main cap of my 1941 85HP engine, there is a threaded opening. On the V 12 engine there is a pipe with a check valve ball in it that threads into that hole. My Ford V8 is missing the pipe, so I don't know if that is supposed to have a check valve in it or not. I seem to remember reading that the pipe and check valve stop oil from running out the slinger if the car is parked facing up a steep hill. Since I had no pipe in my rear main cap to begin with, what are the advantages of adding a pipe? Thanks in advance for your answer.

[Russ/40]

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The pipe on the V8 has no check valve, and helps reduce rear main oil leaks by directing oil away from the possible exit.