factory hydraulic rollers

I dont believe there is a limit to the lift you can use with the stock rollers within a range, how much ? Not sure. I did not have any problems using them with a custom ground comp cam I had made up with about .500" lift.

I would talk to comp cams or hughes about the limitations. Hughes used to regrind roller cams, so they might be able to answer your questions on the base circle etc. Hope this helps !