yeah you can get your carb throats bored but you need to make BIG hp #'s for it to make a positive impact. Putting bigger carbs on slows down the air intake velocity and decreases hp if not needed. Theres a reason a/c put smaller carbs on the 600
yah unless you have sent your motor to a aftermarket company for a port and polish, twin pipes and are runnig v froce reeds, a carb bore will do nothing on the preformace side. start somewere else like clutching.