Oil control, spring pressure, etc.

I borrowed a book from a guy at my work (Title: How to Build High Performance Chevy LS1/LS6 V-8's - Modifying and Tuning Gen lll Engines for GM Cars & Pickups; by Will Handzel).

I've started reading it and there's a section discussing the oiling system and it reads as follows points of interest in bold:

"Oil control is very important to GM as higher oil pressure ties up horsepower in pumping losses and increases oil consumption, which can lead to higher emissions. Because of this, any performance upgrades should be accompanied by increased spring pressure on the oil bleed-off spring in the oil-pump outlet to insure maximum oil flow."

Not that I'm any expert but I've never heard of this and wondered if anyone has done this, what exactly is involved, etc.

TTT Now I'm curious

It is nothing more than putting a spacer between the spring the the retainer screw to add a little more pressure against the bleed-off plunger. There has been much discussion about this. One issue is that more oil fills the top end of the engine and then starves the lower end of the engine for a steady supply of oil. I think they got it figured out with the LS7 by adding the external oil pump that scavenges the oil out of the pan, puts it into a storage container and then draw oil from the storage container to pump through the engine. There are no alignment issues with the LS7 pump, failures are rare and you have a good supply of oil.