Well I don't know the exact limit on those Comp grinds but they'll probably pull to 6200 or maybe a little more. Depends on oil pressure and valve springs and stuff like that. That should be fine for most mild big blocks.

I'm in the process of working with Comp on a project to see if we can run a hyd roller in a 7000 rpm big block with Max Wedge heads. The LS1 guys run speeds like that and more but they have lighter valves and a much better overall engine design so it isn't quite a fair comparison.