I've seen these roller rocker arms but have never had any dealings with them. I've only fooled with the old stamped metal type. Is there an advantage to the roller rockers and can these be put on an L98 with a few minor mods?

 

There are definately advantages to roller rockers. As far as I can tell they are mostly longevity and quality related. They cause less wear and also are much stronger and don't tend to flex/bend like factory stamped ones do. I have a set of 1.52 roller tip rockers under my factory valve covers with no clearance problems. I'm actually probably going to be selling them soon because I want to add 1.6's when I swap cams. If you are interested PM me.