Well like Hank mentioned, you don't have immediate oiling to the cylinders, and yes a light coating of some type of lube is required or you'll wipe out the hone job and defeat the purpose of why your building an engine to begin with, or scuff some piston skirts and have a galling issue or many other possible mishaps. Charles H, my source for this info comes from actual hands on working for over 15 years with one of the most highly respected and winningest inline Chevy 6 engine builders of all times. Having built engines for many top racers in drag racing, circle track(dirt and asphalt), Winston Cup, about 500 engines per year went out our doors, we also worked closely with most all manufacturers in the industry and even conducted R&D programs for numerous cam companies. I also have many years of personal experience(both prior to and since my experience with) in machining, racing and building many different types of Forced induction engines with nitrous and blowers/superchargers where gapless type rings are standard equipment. But to say that you install the rings and pistons completely dry is a quick recipe for disaster.
Thanks, we all have our own ways of doing things I was always taught to hot seat the rings in and have never had a problem on my stuff. Had problems when the oil pump failed soon after starting. When I have/had problems on my stuff is when I started having to pay others to do the work for me and that is still happening today.
Thanks Charles