[blykins]

They can be ordered with any LSA. Like you say, a tighter lobe center will narrow the powerband, but it will also increase overlap, which may or may not be a benefit, depending on the application. It will also decrease piston/valve clearance because of the overlap...you're hanging the valves open longer which increases the chance of bumping one into a piston.

I usually don't use the Xtreme Energy series cams when I do a hydraulic roller, but try to stick with the XFI lobes.