No. I looked North and South and settled on Horsepower Addicts.
I would have taken it back to Katech but it was to far to go for such a small change.
I've been to Tony's and he's got a nice shop but I don't know if he does C6 Z06 head work.
There are other shops with in a 2 hour drive that can do the work.
These guys are also very good
http://raceprovenmotorsports.net/