Has anyone ever tried brazing? I am thinking to open up the cracks with a dremel, and then braze with Muggyweld SSF-6 brazing rods specifically for cast iron using a torch. Maybe I can preheat the assembled engine from the side using a propane IR heater so there wouldnt be any shock heating/cooling.

I just need to seal up the cracks, not to concerned about structural rigidity. I been back from Iraq since July, its time to start getting the car back into shape. Would like to make the ECR in December for HPDE. Will be the first time driving on 17" RR's (thanks Michael Mosty for the donation). Maybe comp school early next year to join you guys for the 2021 season.