You need to give more information, is this a water jacket repair, an engine mount, etc.
Apply MAGNA 770 cast iron welding electrode.
1) Preparation of cast iron befor welding (gouge rod) chip,file, clean wire brush area to be welded, but do not machine grind.
2) open a general area on a 30 to 60 degree angle along crack and drill holes (5mm) at both ends of crack.
3) Select largest possible diameter electrode for crack length vs. thickness of material.
4) Without preheating weaving, run root pass with lowest possible amperes.
5) Clean each pass, peening is only necessary-wire bush between passes.
6) Continue to run stringer beads until desired height is reached.
THE REPAIR IS FINISHED