I've been hearing recent talk about the Ferrea valvetrain. What is it and how does it work? Whats ar3e the benifits of it with FI especially the Vortech?

 

lighter weight valve springs/retainers and bigger valves

just allows you to rev up slightly faster and up to higher rpms as well as make slightly more power since the valves are bigger letting more air in and out of the engine

I think the parts are around $1k and labor is about the same
one of those things you should be doing cams with while you're doing it