Re: Flathead filter
I think Ford offered the oil filter as a marketing ploy because as others have stated here, it is a bypass/partial oil system that returns the filtered oil to the pan, not into the system to be used right away. I'm wondering now if a PCV is more important than an oil filter because apparently Ford's breather system without one is what allows sludge build up from moisture condensation. Frequent oil changes will prevent that, too, of course.
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