Savage_Rob wrote on 12/31/69 at 16:00:04:I can't see the rest of the exhaust but my MAC did that when I wrapped the header.
I pulled the heat shield off and looked things over really good while ago. What I have is just a general bluing starting at the muffler/header connection and extending roughly the length of the heat shield.
The exhaust is tight and no leaks, verified that while I had the shield off.
I took some Blue Away and cleaned the muffler up and got most all of the bluing off. I just ordered me the other type heat shield, as well as some simichrome so I can hit the muffler with a good polishing before I put everything back together.
All I can do at this point is see if the heat shield makes the difference. I'm leaning toward the OEM shield being the problem, as the bluing stops as soon as that shield ends.