Solid lifter on hydraulic cam?
Longgone remember that if you put solid lifters on a hydraulic cam you will loose lift by how much clearance you adjust your valves so most likely you will loose performance. For example my valves have a clearance on .020in and .022ex on my roller if you use a MP .509 cam the gross lift is now only .489in & .487ex. I don't believe this will net a power gain and will probably loose power. With the way hydraulic lifter technology is today there is no need to do your lifter swap. If you really want solid lifters, do like Mrmopartech says buy a solid lifter cam.