If you put ten people in a room who are familiar with auto restorations, whether they perform their work, or are professionals, when discussing the challenges of restoration, the topic of repairing cast iron is likely to come up. Body rebuilding or reproducing ornamental pieces during restoration are fairly common and usually can be achieved without too much difficulty. But mention a cracked or broken cast iron part and shivers are likely to resonate through your body. Cast iron, a ferrous metal containing approximately 95 percent iron with the remainder being alloyed such as silicon and carbon is often used for many vintage auto parts. It casts well into a shape, is easily machined, is ideal for high heat situations (like exhaust manifolds), and even has good compression qualities. Cast iron however doesn't do well under tension and is brittle. A repaired crack in a cast iron part using conventional brazing techniques is likely to reappear when the part is put back i...