These will be a standard 4 into 1 style collector. They will have a 5 inch taper. They are not a true Merge collector but will incorporate some of the internal features of that type of collector. As I understand it a true Merge collector has a much steeper angle.
Here is a great thread on true Merge collector fabrication.
http://www.gt40s.com/forum/how-engines-transaxles/24820...tors-jim-cowden.html
I use a straight edge on end to mark the center of a tube. The tube dia is 1 7/8. This is the slip diameter for a 1 ¾ tube.
Then I lay my template over it lining up the centerline marks and tracing it. It needs mentioning that the template is not a true cone shape as one might think. It flares out drastically at the bottom.
Here are the 4 pieces cut out. I use a high speed cut off wheel to cut them out of the tube.
This is the alignment tool that I use to keep the pieces square. It is available from
http://www.coneeng.com/tech_assist.html
This makes the ends of the taper line up with the slip rings that will also be welded in this alignment tool.
