03-01-2018, 12:15 PM
I have repaired damage such as this both by brazing and gas welding with cast iron rod. When welding, I heat the piece until it is red hot, the slow cool down by burying in an ash bin full of vermiculite(expanded mica). Now days with cheap computer co trollers, I would build an electric oven to heat and cool the piece being repaired. I have also repaired cracked blocks at the head gasket face by "botton holeing" the cracks and closing the crack with interlocking, shop made, threaded copper rods which were peened to expand them after installing. The plugs were then draw filed flush with the block after peening. I learned this method from a pre WWI era mechanics repair manual.