Hi Neil,
I welded tabs onto the headers and onto the sidepipes. I just placed them at opposing pipes diagonally. The pipes then slip fit together and are held together with 1/4 X 20 nuts and bolts. I also used Copper silicone to seal the slipfit gap.
If you are using headers and pipes from A&C and using a small block, the pipes are too big for the small block headers. The ID of the sidepipes is much larger than the OD of the headers. I welded reducers into the sidepipes so the fit would work and not be loose and sloppy.
Attached are pics of the setup prior to assembly.
I got the tabs from Headertech, Inc on Long Island, NY; Their number is (631) 242-8154; ask for Red. I believe the tabs were about $5.00 a set.
Tony
