On my 496 Cuda, I have a solid roller (254,258 at 50, and .600/.625 lift). An easy adjustment once a year, and this year the valves didn't even need adjusting. Idles great and makes serious power. After a lot of research, a solid roller is the way to go for big power. The cam is a Crower. I called them up and gave them my engine specs, and how much power I was after, and they recommended this cam.