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header flange
draw file each one then cut each flang so they will flexinto place seperatly, brass is ok aslong as there is no leakage, hve brased up many manifolds(cast irone )with good results,headers are a little more forgiving, but if you have not brased them i agree that stick weld with a mild steel rod is better , 7018 is a high tensile rod and only makes fileing more difficult. cliff
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