Reply to "3785 Gets a 400 swap, fabbed 180's and fabbed mufflers"

I remove the pipes and mount them in a fixture I made to start work on the tube to flange joint. I start by tacking the tube on a couple of sides.



I made a mandrel that fits the shape of the flange to use to form the ends of the tube to match. I made the mandrel out of some ¼ thick plate that I cut and welded together and shaped

I got this idea from Clayton on the GT40s.com site. Thanks Clayton!
Here is a link to his great 180 build.

http://www.gt40s.com/forum/gt40-tech-engines-induction-...tion.html#post236149





I heat the tube and then hit the mandrel with a hammer and that forms most of the shape.



I finish shaping it with a small trim hammer.



Here is a port welded.



I sand the port flat and mount the headers on another engine I have on my work table to weld the outside of the flanges.