I have seen some interesting heads produced in two pieces on CNC machines. This would skip the whole foundry thing and allow for some pretty cheap production. Of course the heads I've seen were for flathead engines that don't have the ports or valve train. Someone with a 3-D printer will step up and print patterns for a lost wax/plastic casting. It would not take a huge foundry to pour a head. If you can think it you can print it.
