It is their version of the Indy 600-13 head. Been out for a bit. From what I've seen they seem like very good pieces. Was developed for some of the NA classes to be legal without a weight hit..I'm sure the man behind it will chime in and tell you more.

"I am not ashamed to confess I am ignorant of what I do not know."

"It's never wrong to do the right thing"