well I am upgrading to a 261. I run bobtail mostly I figured given the rpms with the .85, it would not be too much with a double OD but I have not done the math yet. I know it wont pull anything with a double OD. It did pull a 41 john deere model A in OD with a 235 which surprised the hell out of me. The .85 just is not high enough for me. I could always use the GV unit and remove the brown lipe if its too much.
