Quote Originally Posted by erik erikson
There is no way a Pro Topline 360 cc head will flow 440 -460cfm you would be lucky to break 420 cfm.The Brodix BB-4 Xtra with a port volume of 390 cc and fully CNC'D with 2.350/1.90 valves on a 4.60 hole will flow around 445 @ 28" of H20 at .800 lift.

You want to take a ride to charlotte and Ill show you a set. I have been getting a minimum of 440. To get 460 I have to angle mill them and use a 52 degree seat but they will go it. Keep in mind there is a lot of porting involved. They are about 390-400cc when finished.