I had a set fail recently. Replaced the failed head gasket, and literally on the roadtest afterwards they failed. Number 6 was the worst, just managed to save the crank. They had all started to wear though.
That's the first CSL I have seen with the shells failed to be fair. If you're in any doubt, or just want piece of mind I'd just get them replaced. You can uprate to ARP bolts as well if you like. It's not that expensive a repair either when you put it in perspective. Although it would be fairly pricey at a main dealer I would guess.
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