I agree. It seem most people talk about flow at max lift but how long is the valve open at max lift. About a microsecond? Nanosecond? What's more important is flow where the valve is open the longest, sometimes referred to as "area under the curve." It's interesting that the racer boys at Mopar would recommend a .750 lift cam for a big block with stock heads when the heads stopped flowing at .670! It was because the heads didn't' stall after .670 lift and the big cam provided a lot more duration in the area where the heads flowed the best.