The top rpm range is. And as Kris said, 50 bigger cubes drop the rpms of the cam 500 rpms. So have to take the usable rpm range and drop it 500 rpms for ur application.
What's the reason you are set on a roller anyways? Than are you going hydrolic or solid?
Crane Cams 359351 - Crane Hydraulic Roller Camshafts - Overview - SummitRacing.com