I don't think a solid head will be marketable. there's not drag racing alcohol class big enough to make it worth while and that's the only place it would work. It has to be a wet head. Hemi valvetrain is expensive, anique, and fragile and would mandate seperate side manifolding and there's not other support for that. I'd rather see dual overhead cams than a hemi setup but again - we're talking slant six. It's a small market that prides itself on low budget with little aftermarket development and support. So you have to be able to use existing manifolding. Nobody's going to deevlop anything for it to mass produce. That would be similar to working on a new set of Ford flathead cylinder heads. No money in it so no money behind it.