I was browsing Racing Beat and MazdaTrix looking at the undersized pulleys.  They don't list the actual size of the pulley, Racing Beat says underdriven 13-15%.  Comparing my 4.5" pulley that would make it about 3-7/8" diameter.  Does that sound about right?  Does anyone have a measurement of the diameter of these?

Thanks,
Mike

Mike McGee, RV-4 N996RV, O320-E2G, Hillsboro, OR
13B in gestation mode, RD-1C, EC-2