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Can you please tell me what is the proper spark plug gap for a chevrolet c3500 2wd 454 engine? Im second guessing myself! I guess. Haha Thank you for your time!

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  • James Peterson Apr 27, 2017

    I can't believe I didn't put the year in. My apologies Mr. Layton. That's strange though, I had them gapped at. 060 then my check engine came on I through on the scanner and it came up missing on #4 cylinder so I saw what I believed was an online copy of my underwood sticker(of which mine are non existent) and it said. 035 so I changed them to that and the check engine light went off and has stayed off about 2 days now. When before it was either blinking constantly or on solid. Any thoughts on that would be greatly appreciated. Thank you.
    By the way it's a 1997. Thanks again I appreciate it.

  • jack layton
    jack layton Apr 28, 2017

    I have tune-up manuals from 1980--2016. They don't have every single year--make--model, but, they have a lot. I looked up 7.4L engine, not c3500. From 1980 through 86, carb engine, .045 plug gap. from 87 through 95, 7.4 L, tbi, plug gap .035. My manuals skip 96 and 97 for whatever reason, starts up again in 98. I think the plug gap differs depending on the fuel system, carb--tbi--sfi, I guess there could be other reasons? Sometimes, different plug manufacturers have different plug gaps. It is interesting.
    Use your best judgement. When the check engine lite came on, what was the trouble code?
    If .035 works best for you, who am I to tell you different.



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  • Chevrolet Master
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I don't know the model year? I looked at 98--02, .060 gap, 7.4L

Posted on Apr 27, 2017


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call a part store like auto zone they can tell you this.

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