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I haven't worked on boxster engines, but have built several air cooled 911 engines. These scenarios come to mind:
1. there may be a blob of thread locking cmpd in the cam at the depth the bolt would reach its torque value leading to a false reading.
2. the threads in the cam are yielding and there is a dislocation at the depth the bolt would reach its torque value leading to a false reading.
3. the bolt is bottoming out
4. the bolt is not stretching due to work hardening or insufficient torque
When you tighten the bolt does it tighten gradually or does it basically stop and the torque spikes up?
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