Very true!! The higher the duration, the higher peak power will be, when you start going huge, you need to spin your engine to dangerous rpms to make peak power which means you need really efficient heads and manifold. Better off with a small duration cam with a tight LSA for a street car! the 226/231 110 is excellent with nice choppy idle. My mate has run 10.4 with a cam only ls1 and a shot of gas with this cam.