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cast iron block

re welding cast iron...
        cast iron is a very poor medium to weld. if its a fine grain
investment casting it's ok but, an engine block is a big dirty casting. what
works best imho (btdt)  is bronze brazing. i have tried oxy/acetylene, arc,
and tig. use low temp, low fuming bronze and apply a liberal coat of paste
flux (or powdered flux added to water) because you're heating a huge
heatsink be patient and heat slowly and carefully to avoid hot spots which
could burn the flux and ruin the job.
86 5kcdtq, tap chip sjm spring
84 5ks
84 5ksw
many cyclops bicycles