It's a noticeable difference. I went with a custom ground solid roller for my 505...the last cam was OK, but it was actually made for my 460 (454) a couple years ago. I had always wanted to get a custom cam done by a gentleman I know that designed the Lunati "voodoo" series of cams. His grinds have always been very agressive in ramp design, but yet they close the valve easier, making it better on the valve train. His numbers at .200 lift are where you can see a big difference. And talk about a nasty idle!! This grind is 255/259@.050, and .668 lift on Int. and Exh. Ground on a 110, I installed on a 102 ICL. It's also a 4/7 swap cam. Next week I hope to have my 950HP Holley to bolt on and tune. That will about do it for this engine. Well, for this season, anyway