spark plug color read

Engine, Trans & Driveline

  1. 1967coronet

    1967coronet FBBO Gold Member FBBO Gold Member

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    I just put pics of 2 plugs on, all 8 look the same. Champion 12s gap at .040
    440 with pertronix ,750 edelbrock . close to 900 miles on this set
    I didn't think they were to bad . What do you guys think ? rich? lean ? ok?
    good guys 007.jpg good guys 007.jpg good guys 005.jpg good guys 005.jpg
     
  2. Jerry Hall

    Jerry Hall FBBO Gold Member FBBO Gold Member

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    Look great to me. Is there a reason you pulled them?
     
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    • moparnation74

      moparnation74 Well-Known Member

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      Normal
       
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      • 67belvedere/225

        67belvedere/225 Well-Known Member

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        tinge lean looking , i have to say mine are the same colour , and 10 000 miles on her since rebuilt my /6 with twin Webers and 268 cam
         
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        • 1967coronet

          1967coronet FBBO Gold Member FBBO Gold Member

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          Thanks guys, I pulled all 8 just to have a look. The 440 is the one I installed last summer. Its been running fine but has that typical water your eyes back bumper aroma.
          I know lean or rich can cause that but crap I don't know what way to go lol.
          Prob best just to not worry about the stink and drive it.
           
        • khryslerkid

          khryslerkid FBBO Gold Member FBBO Gold Member

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          What are you useing for fuel? Additives?
           
        • 1967coronet

          1967coronet FBBO Gold Member FBBO Gold Member

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          Regular 87 octane {no alky} {no additive } this was that motor home 440 8.1 if I am lucky so no detonation problems :)
           
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          • khryslerkid

            khryslerkid FBBO Gold Member FBBO Gold Member

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            Plugs look good for that combo. Hard to see the timing mark on them. I liked this article on reading plugs...
            http://www.4secondsflat.com/Spark_plug_reading.html
             
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            • Darter6

              Darter6 FBBO Gold Member FBBO Gold Member

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              Yeah, All of my vehicles that have carburetors stink way more than our fuel injected car.
              Way worse when they do the "winter blend," and here I thought it was just me.
              Or maybe no cats.
               
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              • Bill Monk

                Bill Monk Well-Known Member

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                Yes! Todays gas just stinks. When I fire up the Roadrunner in the garage, even for the short time until I pull the car out, it reeks
                 
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                • lewtot184

                  lewtot184 Well-Known Member

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                  to me the rim of the plug looks a little rich and maybe a little too much timing. I think a vacuum advance can show a little too much timing though. if it runs and drives fine then maybe leave it alone. I don't think iron heads are easy to set up carbs anymore. the crummy gas and combustion chambers do create a challenge.
                   
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                  • 1967coronet

                    1967coronet FBBO Gold Member FBBO Gold Member

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                    Thanks lewtot, yes its running fine and starts good hot. I will not hurt to try to back off the timing a little. That may help clean up the exhaust a little.
                     
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