Last week we started the exhaust nightmare. The customer wants under-car exhaust and there is NO ROOM in the inn. We had to pull out every trick in the book. Here you can see #4 is still being trial fitted to the head. You can still see a gap in fitting of the flange to the tube. FE heads have a really dumb (hey, they didn't know any better back then) rectangular exhaust port. It makes putting round tubes in square holes really fun! Incidentally, that is one of the HUGE reasons why FE headers are so expensive.