john smith wrote in message
...
How many hours of service should one expect from a set of spark plugs?
(i.e.- Lycoming IO-520 in a PA32-300)

On the typical massive electrode plugs, about 400 maybe if your real
lucky even perhaps 500 hours service life until the center electrode
gets too football shaped. Be sure to clean and regap them at least
every 50 hours.

670 hrs. on a Husky with O-360 and still not close to trashing them.


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