Some say the Shelby heads are lighter and thinner than the E-Brock heads and as a result the E-Brock heads can ultimately be made to flow more than the Shelby's. Maybe, maybe not, "rumor has it" anyway...
I recently saw some data points for Shelby Stage II heads flowing 314 cfm at 700 lift, by the way, must be flawed data, I guess, hard to keep track of it all.
One thing seems for sure though, you got some heads, any heads, that flow 300 cfm or better and your kicking butt and taking names!
