Yes, it is a bypass style filter. So as Steve pointed out the only amount of oil that had to flow through the 5 what look to be about 1/4” holes is what would flow through the one small hole in the center. In the NAPA filter the oil just flows through the two smaller holes. I would guess the mfg. of the filter you took off has 5 hole end plates punched out like that by the thousands. Since many filter applications are a general diameter they can thread the center hole for the proper threads and use those same plates for hundreds of applications. Many of which today are full flow which require to be able to flow all the oil the pump puts out. The mfg. of the replacement NAPA filter which is WIX for some reason decided to utilize a special end plate for this type of bypass filter.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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