Suptter and jaka, thanks for the speedy replys...I guess it's the "blotchy" spots of blue (not a uniform color) that concerns me. I've been doing this since the early 70's, but have never encountered this sort of thing...I am familiar w/ the bluing of motorcycle exh. pipes due to heat, but this is the first time I've seen it INSIDE a cylinder...There's no brass exposed, and I know it's never been run lean, because I'm the only one who's run it...I guess maybe I'm just a little paranoid after hearing+reading about the other occurances of peeling...I might as well use it, and if something happens, then I'll take care of it, after all, it ain't doing me any good just sitting around, aye? Thanks gentlemen, I'm not gonna worry about it, I'm gonna use it and enjoy it...Tom.