Originally posted by John
its not a replacement, its not fuel economy (that is a side benefit), it is the ability to use two distinct cam profiles, optimizing low, mid, and high end power
Exactly. That is the main reason. To have a higher profile cam lobe to get more power at the high rpm. Pretty much with a single lobe cam profile, you can either have low end power, mid range power or top end power. Really never a mix.