Quote:
Originally Posted by 40cpe
If the filter media in a full flow filter can't handle the output of the oil pump (and I doubt it can), you have unfiltered oil going into the engine through the by pass valve. True, it all gets filtered, just not every cycle through the engine.
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Why would a flathead be in different than a modern engine is this regard. Oil flow rate out of the oil pump should be comparable. A good spin on type filter should not be by-passing oil with proper change intervals.