Thought I would post up some positive feedback for Kenny at Black Magic Racing 804-761-7101, who just cut my Mercury heads. He got them on a Friday and finished and shipped out with UPS the following Wednesday. I also wanted to purchase o-rings from him, but he couldn't get them in time to ship back with my heads. So he texted me 2 Amazon links so I knew which o-rings I needed. My heads had the old style o-rings and he cut them for the new style. Plus he sent me a video of my own heads being cut, very cool.