[CMcAllister]

Drilling passages to the mains, opening passages in the rear of the block, port matching the pump to the cap, massaging sharp corners, tubing the block (once, what a mess, just bush the bores), even fabing a dual pickup assembly were among the first things I tried. While they are, without doubt, beneficial, It didn't address the core problem, which is keeping oil on the journals in question. Measuring oil pressure at the port on the rear of the block tells you nothing about what is happening to the pressurized oil once it gets to the #2 and 4 mains.