[SOLVED] Welding/brazing diesel engine block

I wonder if plumbing solder wouldn't work. Just wire wheel the crack, gently heat until it will liquify the acid flux paste, then heat a little more until it will melt the lead solder. It should be gentle as far as thermal stresses go. And 200 degree antifreeze should be well below the solder melt point. Since sheet metal used to be soldered by ductworkers as a matter of course in the 30's, then it should work well enough with cast iron too in this low demand application I would think. Don't vee the crack, let it be the wick. Capillary action. Cheap, quick, low stress, semi-permanent. Maybe. Just a thought.