The only thing I've ever heard about them is straight out of the mouth of a Jasper Engines rep. He was telling us about how they used revised oil pump pickups that were larger and flowed more oil to help combat cooked oil in the pickup tube. He said they had seen a LOT of cores with either very restricted pickup tubes or completely stopped up tubes and that was their fix for it. Other than that, I have no experience.
Rusty that happened to the first while whale, a 5.2. Dodge went to those God Damned "trumpet" oil pickups. the tube simply comes and bends straight down, and there's a small screened "trumpet" on the end. They plug up with sludge.