Hi pknauth,

Back when I was in high school, I took metal shop classes, and one of the projects that we did was weld a crack in cast iron engine block.

First we used a angle grinder to clean the crack before we started welding. Then just one "tack" (dot) at each end, then wait 10-15 mins when the cast iron is fully cool. We kept repeating this until the crack was fully sealed.

One thing about cast iron it doesn't like to get real hot when welding on it. If it gets to hot, the crack will take off, and get bigger. eek
Chevyboy62

My truck don't leak oil, it just marks its teritory.