Grady, the exhaust measures 1 3/8's, but that's at the narrowest point. It's like there's a washer, so to speak, just inside the flange. You can feel it easily with your finger. I'm sure the actual pipe, inside, is closer to 1 1/2". I put them on the side, and installed 1 1/2 headers.
John, You know I had the hardest time trying to get the heater fixed. Everyone scratched their head wondering why I cared, living in Hawaii. I've included a shot of my oil line. It appears to have two orange stripes, repeated. As far as the case goes, I gave it to my machine shop, after doing basic triage. When I got it back, it was all elbow. Scotch-brite pads, carb cleaner, contact cleaner, lots of air, etc.
