He does release some information on the Avenger 85 facebook group. That is where I got the pictures I posted in the other thread.
I am pretty much sold on the Avenger being my next engine purchase to replace my Phantom, or to build a different bike.
The Menace isn't a bad engine. The top is just milled off and a the Smoklik head installed. The head is a good design and does aid greatly in keeing the temps down.
I just like the design and features of the Avenger more, and I suspect it will be the same as a Phantom in terms of power.