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And 17 ft-lbs seems like way more torque than necessary for spark plugs in an aluminum head. Did you have any anti-seize or lubricant on the plug threads? If so, you need to reduce the specified torque value by 20-25%; otherwise, you risk over stressing the threads. Most torque specs are based on clean and dry threads.
I never use a torque wrench for spark plugs. I just use a short handle ratchet and don't over do it. You can feel when the new spark plug crush washer is fully collapsed.
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