I've learned ethanol gasoline is incompatible with certain soft metals...including brass (the power piston) and some pot metals, aluminum, zinc (the air horn) and copper. Ethanol sets up corrosion and as I understand will cause some dissimilar metals to bond in the corrosion process...which obviously spells doom for the whole power circuit in the Rochester. From what I was led to believe when discussing this with several folks, unless you made the sleeve and the power piston out of 316 stainless you don't stand much chance of ever making the original design work very long today.
