Hello,
I just stumbled with this post while talking to Meteoro.
Like Meteoro said, this head has been made for an argentinian vehicle that is going to participate in the formerly known as "ParÃs-Dakar" rally. It's not welded, the mould is unique. It is of course based on the argentinian aluminum head, but the ports and chambers have been tailored for the specific application.
Valvetrain is operated by a multiple gear assembly. No chains or belts.
I believe the OHC requirement was dictated by the guy who's behind the whole project.
About the crossflow idea, that would be a nice thing to have with an OHC head, but on a OHV application, port shape is compromised by the pushrod holes (like in a V8 head), and coupled with parts interchangeability, it's not really worth it.
Best regards,
MartÃn