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This is a typical freeze crack it is unlikely to spread probably been like that for years . The crack most likely has self sealed by rust . I would not try to seal it with JB weld etc etc . V ing the crack out could cause more problems especially if the block is thin in that area . I have run cracks like this for years BARRS STOP LEAK is the way to go IMHO .As the block has been dry a while it might weep a bit to start with . "Nothing ventured nothing gained"
John in Newhall California a siopover en route to Chandler AZ from the Turlock swapmeet .