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If I had to bet it would be they or you didn't retorque the heads at the 600 mile.
I don't see anywhere in the V7-iii manual where checking head bolt torques is on the list of required maintenance. Does this only apply to earlier models, or can someone point me to the right place in the manual?
This was discussed recently at Guzzitech where Todd and I both mused that it seemed like it was no longer needed.I mean if it was specifically listed for the smallblocks up to the V7II and IIRC there had even been a service bulletin reminding dealers of the need with the launch of the 1TB models, but is now missing from the owners and service manual's maintenance schedules, then it would seem it is no longer needed.