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  1. #1
    Sr. Apprentice
    Join Date
    Jan 2011
    Vancouver, WA

    Default sparkplugs 2500hd

    Hey fellas, want to do a plug job this weekend for my 03 2500hd 6.0l, wondering what you guys recommend. With gas creeping up close to 4 dollars a gallon I'm trying to squeeze the most mileage out of my truck. Also is doing the plug wires worth it at 85,000miles? If so what do you recommend?
    Thanks guys

  2. #2
    stephan's Avatar
    Join Date
    Sep 2010
    Far West, Oregon USA,
    Blog Entries


    Hey Cameron, welcome to the truck club. Stick with the AC Delco plugs. Many members have posted on here that they have had nothing but trouble with other brands. For determining if your plug wires need replacing, check the resistance with a multimeter. They are too difficult to judge condition just by looking, unless they show signs of melting on the exhaust, or arcing etc....
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol

  3. #3


    Welcome to the club. Your factory plugs are good for 100,000 miles. I took mine out at 80,000 and they were almost like new. As others and myself have found with GM's they run best with the factory A/C Delco's. I would change the plug wires because not only do they have 85,000 miles but they have age, almost 7 years.

  4. #4
    Sr. Apprentice
    Join Date
    Jan 2011
    Vancouver, WA


    Thanks guys, im head out to the oreily today

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