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Originally Posted by AtomicLabMonkey
higher required torque/preload for those fasteners?
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Huh? Fasteners do not normally define the torque, the materials you are fastening, or the tolerances in the parts determine the torque. Otherwise you have failures like this, or deform parts in a manner which might contribute to failure.
I agree with the cause assesment based on the damage, but the fault lies in the higher torque placed on the fasteners, not the block materials or design IMHO.
Just beacuse you use a higher grade bolt/fastner in an application does not mean you increase the torque on the fastener. If anything, i would think you might decrease the torque as the fastner would have less stretch.
I need to go back to my college materials class...