Here's the flow test sheet for Tooseevee's head in the attachment below(pdf).
They called it the "Big Head" because it looks similar to the old Big Head, and so they started calling it the "new Big Head". So, that's why the file name is like that.
The columns labeled "1" for intake and exhaust, are the "before" flow test, and the columns labeled "2" for intake and exhaust, are the "after" flow test.
Note how the exhaust port is no longer backing up at lifts over .350", and the port is much more stable.
Also note how we now achieve more intake flow at .350" lift, than the OEM port flowed at .600" lift(if it could have ever gotten there!) But if we put our roller rockers in there, it could take advantage of all the increased flow up to 213 cfm @ .600" lift with the same porting that we put in it for this job.
In the AVL, the stock rockers are approximately 1.1:1 ratio, so the approximate max lift will be around .330". So, you can ballpark the flow level to be between the .300" and .350" rows on the chart.
This job was done to get the power improved in the normal rev-range, and so we estimate probably 6000 peak hp rpm, similar to the Fireball. It will rev above that, though, if he wants to, but it will just hold roughly the same peak power for a hundred rpm over the peak hp rpm, if necessary.
There will be a nice increase in the midrange torque, where most people are interested in riding.
Now, this is our response to what Tooseevee asked for, and we feel that this is a good package for the "AVL Fireball" type of head work. It fits the same niche as the Iron Barrel Fireball does.
However, if people want less or more, or even a lot more for racing or something, we can respond to those needs also. We can put the roller rockers into this head too.
So, we can meet almost any request for power upgrades on the AVL now.