Posts: 850 From: Lakewood, CO, USA Registered: Jun 2001
posted 03-20-2003 06:07 PM
I haven't worked on the Roush heads but I have used a couple thousand cartridge rolls reshaping ports. In general you want to use the rolls to blend surfaces together and smooth out the walls. If you are trying to remove specific metal without enlageing everything in the area, use a carbide burr. I recommend an olive shaped carbide because you can control exactly where it is cutting. after you have the metal shaped like you want, use the cartridge rolls to smooth out the area.