Came across this info on another site, thought I would pass it along....
mentions a company has redesigned the head and block of the ford 4.9, to make these components even stronger and supposedly they are producing or have plans to produce these parts soon. The intent is to replace the existing industrial engines (air port shuttles, generators etc.) and convert them to hydrogen, but they still offer a gas version. Curious, how accurate to the original 4.9 block are these, as in, could they be a replacement block for a passenger vehicle? We shall see....
Check it out.
http://www.hydrogenenginecenter.com/products.htm