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Since there are basically three different triangular-style flange sizes used on headers these days we had ordered the largest version, which if my memory serves me correctly were 3 1/2 inches-which matched the Sanderson headers perfectly, as you can see. I slid the disc/flanges over the core tubes, inserted the assemblies into the bell of the headers, and then tapped the core into the bells until the inner discs contacted the inner wall of the headers. Once they were correctly located, I carefully removed the assemblies from the headers and tack-welded the discs to the core tubes. View Related Article
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