There was a diaphragm between block & filter with a hole positioned toward the top. This prevented drain back to the pump below the level of the hole. However, other than the tight clearance/oil film at bearings, there was nothing to prevent drain back through the center outlet of filter.....this should take a very long, nearly infinite period of time in a non-worn out engine & even then get you down to a half full filter. The FORD spin on adapter has a similar hole at the top. As for the anit-drain back flapper valve incorporated in spin on filters, in my observation those are not much of a valve! Some seem a little better than others, but I would not expect any of them, even 'original' Motorcraft to hold for much time.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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