Ti for the shaft or rocker bodies. The only peculiar thing I have seen with Ti is that it is not very forgiving in applications where it rubs or contacts another moving metal. All valves and connecting rods have to have the surfaces plasma coated that contact a moving surface, ie. the valve stems for valves and the sides of the B/E of the rods where they rub each other or the crank cheeks. Other than that, you would definately have the most exotic set of rockers for a Stovebolt ever....
