At least some Buick V6s used stepped main oil galleries.
When the Porsche 928 came out, they were noted for having a much larger than normal main oil gallery, which functioned more or less as a plenum.
Modern designs like the Ford Mod V8 or GM LS1 have a single modest diameter all the way...
"The Internal Combustion Engine in Theory and Practice", volume 2, by CF Taylor, MIT Press. There are several editions. It has the largest section on balancing that I've found, plus an extensive bibliography.
I paid $100 for mine 25+ years ago, but if you're in the USA you can check it out...
There are many books that cover balancing engines, but the standard reference is "The Internal Combustion Engine In Theory and Practice" by CF Taylor. Any of the editions will do.
Most of the other balancing texts I've seen have been abridged versions of Taylor.