We have been fortunate enough to work on some Furies lately, and have seen some of the parts and mods that they used back in those days of Shell Thuet. We have seen and analyzed those old Harmon & Collins cam profiles, seen the ports and valves that were being used, etc.
Very interesting model in the Bullet line which can be mostly replicated today., and the most recent developments have put this model into a whole new league for power and speed.