What can you guys tell me about the failure mode of this head gasket. It's from a Cummins 8.9L 6 cylinder diesel, ISL. The number 6 cylinder developed a breach of the firing ring near the outer two head bolts. We've seeing a pattern of these failures. I don't know if it's a head gasket issue, or something else (head bolt adequacy or torque, liner height, cylinder head defect, or something else). Any help is very much appreciated. Thanks, David
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