I have a set of Smith fine wire plugs on a I-O360. I have 670hrs on them. I
checked compression last week and inspected the plugs and they still look
great.
Question IS...how many people have heard of Smith Plugs?


Steve



"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)