The mains in the block (bulkheads) or mains on the crank?
Crank? NEVER!!! It WILL break...
The block? Iffy. Welding cast iron is an art. In most places, a crap-shoot. "Spray" welding will fill the holes, but won't add any strength lost to the crack. Arc-welding (nickel rod, low energy) MAY work, but has been known to extend cracks ("spider webbing").
Best of luck. We would rather machine up another block to be safe, unless you simply have SO MUCH money in the block, it's worth the risk.
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