My 2011 Drag Pak Challenger book says you can rev it to 7,200 RPM's but it doesn't say what brand of lifters they are. I don't know anything about hydraulic rollers. That sounds up there to me. I think of hydraulic rollers as being a 6500 rpm/.650 lift items. I'm not the type to push the envelope. If I was doing a wedge build I would just put the Trick Flow top end on a 512 stroker kit. Everyone says you will get 600 hp with that. And that would be enough for me. I love watching Andy's builds and admire his desire to get the last horsepower out. But that's just not me.