samualt,
I'll let you know in a year or two as I am using aluminum this time around (they look pretty
). I don't think there will be a problem as they appear to be of the heat treat varity and machined quite well. I had to bore them out to make them fit.
If properly setup, I don't think there will be much wear on the surfaces and with tight fits on the shafts, there should be no play. This is also a function of guards on the setup. This will keep the swarf out of the action and not allow the wear problem in the first place. Also, I would be more worried about the swarf "cutting" the belt than wear on the pulley.
Bubba