Now just need to figure if it is a Cyclone or Super Cyclone. All I know is that with a very tired engine and what was later found out to be a worn jet drive, we did 62 on the Colorado river using GPS. Never did clock it with the rebuilt jet, headers, recurved ignition, and Team G manifold with large scoop. Picked up about 300 rpm. 4500 is about all she would, do the engine was just too tired to do more. So whatever 300 rpm more would be. I guess somewhere between 65 and 70. These things must be scary with a fresh engine in them. I was going to sell it but as I learn more about it and now I have the motor out, I am having second thoughts.