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I would still like to hear from someone that has the iron headers off a 383, to know whether the outlet flange has a relief cut or fillet inside....please go kick one over and lemme know what you think. thanks

Yes, I am retaining the cast iron factory manifold. I am just wondering whether there is a filet inside the flange that this raised section of flared pipe will fit in. If the joint surface is flat, I am going to see a problem. It seems that some mfrs simply weld the pipe into a flat flange...

I just got a new system that I am mostly happy with, but have a question. The pipe thru the new flange for the header joint, has been swaged over the flange in a nice clean arc. But, this sits proud of the flat flange, and I am concerned about the seal. Vendor says that the cast header has...