I know you are referring to Hillside, so don't want to leave a bad taste in everyone's mouth. Hillside's knowledge, headwork and prices were great. Hillside's stage III porting on the CVO 110 heads is a top notch porting job. They flow excellent numbers and when the 20° dome is cut into the chamber they flow even better. I couldn't be happier about all those things.
The coatings didn't work on a 200+ ccp build that is my fault, not Hillsides. Now, as far as the order of the coating and valve job were performed and the bore size of the head gasket that was used is where I got frustrated. The coating got masked off and applied with a 4.125" bore gasket. Scott said he sent a 4" bore gasket and Swain Tech said they don't keep gaskets around there and used what was sent. Scott quickly took the heads back to have them re-surfaced for me for no cost....again he was doing what it took to get this going for me. After that, I found out that the coating had made it onto area of the seat and caused the valves not to seal properly. I was asking them to work with coatings that they don't normally do, so there is always going to be hiccups. To get this going, I just had to find someone closer than New York.
Bottom line is that I would use Hillside again for headwork....Scott and Craig know how to get a set of heads flowing.