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spark plugs

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  • spark plugs

    i have a 2005 silverado 2500 factory cng with 172K. what spark plugs should i use? i have not pulled the current ones to see what they are. chevy recommends acdelco iridium 41-110 plugs but they do not see the cng engine for that year. i heard that cng does not like iridium and platinum should be used. if i go to autozone they do have the cng engine but do not give the iridium plug as being compatible with that engine. they recommend platinum. what should i run?

    also, what spark plug wires should i get? any difference for cng?

  • #2
    We used to recommend AC Delco iridium plugs for our dedicated NaturalDrive conversions, see this thread:

    Many of these vehicles have 10 years on the road and hundreds of thousands of miles behind them with no spark plug issues.

    I don't imagine there will be any need to have special spark plug wires. Electrical current is electrical current... they don't see the alt fuel.


    • #3
      do you use the factory gap, .040?


      • #4
        We used gap: .042-.046"