I was using Evaporust to remove accumulated rust in the interior of the manifold. I noticed a leak in the tube just above the flange that attaches to the cylinder head. Further inspection revealed a crack of about 40 degrees of the circumference clearly visible in the interior. Is such a crack repaired by brazing? Would the heat generated by brazing be enough to warp the assembly? If not brazing what method of repair is used, if any?
Thanks