David Zitzmann Posted January 24 Share Posted January 24 I received a new exhaust system today and the header pipe is flanged. The one I took off does not and just had a flat gasket. Which is correct? If flanged it seems the gasket must be thicker? Link to comment Share on other sites More sharing options...
avgwarhawk Posted January 24 Share Posted January 24 It appears the small flare is taking place of weld at the flange. Assemble it with the gasket. It should seal without issue in my opinion. 3 Link to comment Share on other sites More sharing options...
EmTee Posted January 24 Share Posted January 24 Is the pipe welded to the flange, or is it simply held by the flare? If the former, I'd remove the excess pipe above the flange and use the gasket. Link to comment Share on other sites More sharing options...
Mark Shaw Posted January 24 Share Posted January 24 A donut gasket should work to transition both flange types. 1 Link to comment Share on other sites More sharing options...
Brian_Heil Posted January 24 Share Posted January 24 Easy does it when torquing down that flange. Many a Buick out there with the cast ear(s) on the cast exhaust manifold snapped off. 6 1 Link to comment Share on other sites More sharing options...
nat Posted January 24 Share Posted January 24 The flat flanges and gasket should be tightened incrementally and uniformly but will probably work fine if that is neglected. With the protruding flare in the center, tightening one side before the other will tilt the flange against the gasket on the first side and bend the flange when the second is tightened. Best might be to use self locking nuts, (not nylon), and take care to keep an even pressure on each side. 1 Link to comment Share on other sites More sharing options...
EmTee Posted January 24 Share Posted January 24 Judging from the picture alone (and not knowing what the mating flange looks like) I'd be tempted to flatten the flange that's sticking up, dress it flat with a file and then use the gasket. Link to comment Share on other sites More sharing options...
David Zitzmann Posted January 24 Author Share Posted January 24 I may file it down a bit, but the flare is what keeps the flange from sliding over. That and double up the gasket. It needs to be even and cannot tighten to much or the ears will break off the manifold. The original one had the flange welded in place with a flat mating suface. Thanks for the info all. Dave 2 Link to comment Share on other sites More sharing options...
David Zitzmann Posted January 26 Author Share Posted January 26 Came up with this as a solution. Took it to the lathe🙂 4 Link to comment Share on other sites More sharing options...
EmTee Posted January 26 Share Posted January 26 That's the way! Link to comment Share on other sites More sharing options...
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