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C6 Corvette ZR1 & Z06General info about GM’s Corvette Supercar, LS9 Corvette Technical Info, Performance Upgrades, Suspension Setup for Street or Track
Could it be a flaw in the drilling and tapping of the head? It looks like scuffing on the rim of the bolt as if it was bottoming out in the head causing it to separate. In other words, maybe the hole wasn't quite deep enough.