To be clear, we are speaking of "pre" filters not the on engine which best be OEM. Much of the Racor marketing material is hype regarding Aqua bloc, or at least not verifiable after a filter has aged a six months or more. But best to use the real deal as they fit right, have the right plastic and right O rings.
If I were to start over with my filter system I'd not use any of the old style (check their website to see the many filtering options they offer) Racors. Just two stages of spin ons (30u followed by 10u) and then the on engine. Look under the hood of a dozer or big haul truck, this is close to what you see. Cat, Fleetguard and Parker Hannifin dominate this market
As oft repeated here, read what Tony Athens says about marine fuel filtering. His Seaboard site is loaded with all sorts of good marine info on many subjects.
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