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Old 11-04-2019, 07:37 PM   #10
JSeery
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Join Date: Nov 2012
Location: Wichita KS
Posts: 13,402
Default Re: late flathead oiling?

Yes, modern filter do have by-pass valves in them, at least some do. Without a by-pass how is oil going to reach the engine oil passages if the filter becomes clogged? The by-pas in the engine is to regulate oil pressure, but the oil has to get to it first. If you connect the fitting on the spin on bracket backwards you can also end up with problems in short order. Just keep in mind that this arrangement much be setup correctly and maintained or you run the risk of not supplying oil to the engine main oil galley. There will be some oil to the rear main as that oil does not go through the filter (that is where the 95% name comes from.
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