i don't really know how much faster it is if at all. i went from 210 cfm to 287cfm. slightly morethan a small base 2gc which is rated at 278 cfm. Supposedly there is a small base 2gc with the same size venturi as my dueljet (7/32) that was rated at 311 cfm. I have never seen one but i am FAR from a rochester carb expert. I believe most of my driveability gains are from going from a wore out monojet to a reman dueljet. On the old carb you could shake the mixture screw by hand. The remaining other gain is from a little more cfm and the efficient triple venturi system. I expected it to be better, even i was surprised by how much better it runs. What i have is a little more than the front half of a 390 Holley. Jay
