Re: Head Porting Bits
To reduce the hop you need to slow down your grinder, or try holding at different angles.
I have always used Mac carbide burs for all my work. The seem to hold their edge pretty well, and have a full warranty on them - if they ever dull they will just give you a new one for no cost.
After you have the desired shape you need to switch to cartridge rolls, and then to cross buffs for that final finish. Mac used to sell a very complete kit, but now there are very few left. I have tried the Mr.Gasket set, which was about the same quality, but had very few rolls included in the kit.