Hey Mark, it's a BB Rajo head with a homemade overhead cam set up made by Ellis Gray a few decades back for the Long Beach hillclimbs. In my "future project" pile I have some older partially machined SOHC Koukol castings for my BBR Rajo, I'll bring them to a FAST meeting and show them off one of these days. Mike
Got it from an article on F.B. http://www.automobilemag.com/news/the-race-of-gentlemen-2017/ Automobile Magazine, Good article and great pictures!