this shit sucks man. that happend to my last block. you will probley have to re tap as those bolts are so small it makes extremely hard to extract them. PITA man, those bolts dont have to be tightend very hard, just snug them good and your fine, I tighten those things now like their made of hollow glass cus I hate re taping a block, I like having things stay how they were from factory. and just like 4wheel said, If the extractor snaps your f-ed