I agree with the others, and you'd have a hard time convincing me that it's not a crack. That frame is big with long tubes, and in it's racing career has seen a lot of flexing. And, the dude who rode that frame was big. I'd call the frame used up!
You did a good job of hiding the crack. Put it together and ride it. The crack will resurface if it is indeed a crack. Oh, and do a close inspection of the bottom bracket area as well.
Last edited by reddog3; 03-28-12 at 09:24 AM.