392 stroker oiling problems

What was the main and rod bearing clearances? with 3/4, you have more load carrying capacity than full groove. Its the flat where the oil forms the wedge. Not the groove. The wedge holds the weight, the groove just passes it to the rod bearings. You sound like the rods are fine, but the mains are starving or cant handle the load. It may be the wrong type of bearing for your use, and they simply gave up. #5 is much wider, so more load capacity and no damage. You got plenty of pressure, and decent volume with the passages enlarged, so I dont think 3/4 groove will hurt you, and they wil be better able to handle the load. If your main bearing clearance is more than .0025, or your rods are over .0025, you may want to tighten that a little. Rods I would want .0025 on, no larger, and mains I would want .0002-.0025, again, no larger. Taper of any kind will hurt you. So make sure when they turn the crank they eliminate any taper they find. To cut oil to the top, you simply drill the deck surface where the oil passage exits, and either go large enough to thread in a Holley jet, or (my choice) use a hex type grub screw drilled to the size you want and deep enough to be recessed in the deck surface. Windage trays are not scrapers. A windage tray only comes near the outer edge of the crank counterweights. A scraper bolts to the block and is fit to the rotating assembly, and literally pulls the oil trapped in teh airstream away and directs it into the pan. You should have one... For an oil pan, when I need something special, I use Canton. They are in CT, and I can go there to see stuff and pick it up. I would pick thier brain on a custom deal for you, with baffles or traps and a windage tray, and then add a scraper. I'm not really up on dry sumps, but if you have 1.5qts that drained out after shut down, I would think you might be a little thin on volume where you need it and tightening the clearances might help. I would expect at least 2qts to drain back after it shuts off... but again, it's getting beyond my expertise at that point. I have only personally used King once. And that came thru a freind that got them. but, I called and there is a place in FL that stocks teh rods, and can have the mains in a few days drop shipped if needed. Pro Power Performance Parts, (954)491-6988. Kings are a much more consistent bearing than typical Federal Moguls or Clevite. My buddy uses them in very high output import engines. I know a few builders that use them exclusively. Again, I usually dont get to the levels where I feel stuff like that is needed.