For me......cracked mains = throw the block in the garbage. I will not try and repair a cracked block. I will very rarely even sleeve a block unless it is a rare restoration engine that is hard to replace. I just threw away a 66 corvette 425HP 427 4-bolt block because it was cracked up through a main web up towards the cam tunnel. I cost me $1900 to replace the block if that tells you anything.
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