And they've not done any new castings since the Pro Stock Trucks days either.
As Wes eluded to, most of the BBM guys aren't interested in anything other than the stuff that is available. How many engines do you see with Predator heads at the track?
Back here in Ohio a LOT of them are Predator headed, and plenty fast. But still apples to oranges comparison.
I was trying to think of a BBM head that was decent and fit on a factory bore space block, I probably should have used a B1 head in my example instead. I shied away from it, because that casting hasn't really been changed since the early 90's, even the PSO version.
