I was lookiing at the flash in the seams inside the tubes and thought they might be cast stainless. I'm sure your're right that it is stainless tubing. I still need to check the port match. The beads around the inside of the flanges are huge and I'm sure I can smooth off some of that without any problems. Thanks for the replies. I'll post pics of the complete headers.

So how did you guys get them clean enough down in the tight areas to coat

Tom