"Roller" rockers typically are associated with increased lift, but it not necessay to desire the ultimate performance to justify the use of roller rockers. While a samll gain can be realized by the reduction of friction the most tangeable benfit comes from the fact that roller tip allow the valves to be pushed open with very little side loading. This results in longer valve guide life, longer valve stem life and thus much improved consistency of performance. Roller rockers will pay for themselves in both reduced cost and improved performance. If you are stisfied with the performacne of your motor and or already have a high lift camshft, then these standard ratio rockers (1.3) are one of the best things you can do for yourself and your motor.