I assume you are torquing maintained spark plugs to 13 ft./lbs and not new plugs:?: The service manual only addresses the torque for re-installing used or maintained plugs.It's OEMs for me. Always got them from the sponsor of this board.
Just as you are about to put the wrench on the first spark plug, blow a burst of compressed air in the cavity to dislodge anything that you don't want to fall into the engine.
Add a dab of never-seeze to the threads being careful not to smudge the electrodes, and torque the plugs to 13 ft. lbs.
Most importantly, never, EVER change the spark plugs on a hot engine. Make sure the engine has completely cooled down.
Good luck with your wrenching.