I had to build my own headers for my bb chev by piecing together mandrel bent tubing in sections. I tigged it and THOUGHT all the seams were totally sealed.
I was wrong.

One area where all 4 tubes came together real close is the problem area. Now I have that hissing noise that sounds like crap.

The reason the area is a problem is because it just isn't accessible with a welder, so re-welding it won't solve the problem.

Anybody have any solutions?
How about chroming (I don't mean decorative chroming), would that fill tiny holes?

I'd be happy if I just got rid of the hissing noise.