If your looking at strength and true rocker ratios in a performance H-flat cam Roller tips are all that is needed in sub 6500 rpm motors with realatively light spring pressures.

Your not going to notice any difference when you install roller rockers. It's just a reliability issue with large springs and big cams.

When ever you see claims about HP increases with any product be very skeptical.

If I added up every power adder I have I should have nearly 1000 hp.