TTI's are leaking

Yup, you're sure nuff supposed to. I remember when I bought my Dougs for my 64 Valiant that was in the deestruckshuns along with a tube of high temp RTV. I would never assemble a slip fit header dry. You'll never get them apart because that is where moisture will build up and rust them sumbitches together everytime. Whether they're coated or not.