Right....sort of. The dyno 2003 program allows you to change the ramp from mild to wild. The stock cam spec'd out at a 2.3 which is between 'OEM' and 'mild". But It doesn't take into consideration the rocker ratio, which could change the open/close rate. And Adding roller rockers is a way to effectively increase the valves 'rate of rise', which can turn a mild cam into one that works like it has fast opening/closing ramps!:grin: The 2003 manual describes some of the math is uses in the calculations. I'm still reading it tho. But it uses the valve size as a start to calculate MAXIMUM possible flow, then takes the type of head (stock, or ported) to determine the amount of restriction there is.....and subtracts that from the maximum. The alternate method is to directly enter known flow numbers... But I haven't yet grasped what it actually does with those flow numbers. Anybody get to that page yet?