CNC-Dude, thanks for your input.
I agree, copper would not be my choice, but since this engine was setup for copper, I wanted to keep it to save time, just for now.
I also suspected on remains of super glue, but I scraped the groove really well.
This is my first time dealing with copper head (and o'ring). On the installation of the copper head, I'm planning to spray it with K & W Copper Coat... Or should I use Hi Temp RTV sealer instead?
