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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Hi Larry,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>This is a link to the color chart I used. I think my plug color is close to #14. <a href="http://hpibajass.com/spark-plug-color/">http://hpibajass.com/spark-plug-color/</a><o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>The carbon marks could be left over from the oil I used on the threads when I installed the plugs. I am curious about that too. There is some carbon build up on the tops of the pistons but I don’t think there is much; it is hard to tell. When I was first tuning the car it was on the rich side; that might account for the carbon marks too.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>I am using Chevron with Techron because it is close to my house. 92 octane (R+M)/2. It is California winter or summer blend depending on the time of the year.<o:p></o:p></span></p><p class=MsoNormal><b><span style='color:#1F497D'><o:p> </o:p></span></b></p><p class=MsoNormal><span style='color:#1F497D'>Cheers,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>John Spaur<o:p></o:p></span></p></div></body></html>