Bullitt Wheels - How to open up bore?

I agree with prior posters that machine shop is the ideal place for this modification. However, I have modified both Lincoln LSC and Crown Vic alloys with my drill motor and a 2.75" diameter cone shaped bit I bought on Ebay. With it's larger diameter it's easier to control the amount of material you remove and to keep the center round. In both of these cases there was only about .060 of material that had to be removed from a cast in ring around the circumference ID of the center hole. Not sure if visible in pic. Not having looked at the "bullit" wheels up close I'm not sure how much material you have to remove. I did this myself because the machine shops I approached in Tucson were pretty consistent in wanting $100 per wheel to modify them. Their price, according to them, was based on the fact that the wheels were to large a diameter for their lathes and they had to do extensive set ups on a vertical mill.