Also remember that if you swing on that wrench it is very easy to
strip the threads in an aluminium head. Over tighten a little every
time you change the plugs and the thread will eventually go.
Spark plugs are often the most over-tightend thing - there really is
no need. They don't need more than moderate hand pressure. If in
doubt, use the torque wrench.
--
Stewart Hargrave
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