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Hi-brazing certainly is a good means to provide a permanent repair. However, before applying the required heat, I strongly advise to obtain at least a flat piece of 4″ x 4″ x 1/2″ angle, then using every bolt hole in the manifold, ensure that each section is secured to the angle to minimise the chance of distortion. The crack area must be buffed back to bright metal, with the crack slightly V’ed if possible. If a brazing torch is not available, still bolting the manifold to the angle for stability, cast welding rods may be able to be used. Again, the V prep should be put in, and before welding, gently warm the manifold before welding. Allow to cool naturally. I have successfully used both methods over the years.