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How to read Racing Spark Plugs - Dragstuff
https://www.dragstuff.com/techarticles/how-to-read-plugs.html
How to Read Spark Plugs - Welcome To Underbone Drag Racing
http://underbonedragracing.weebly.com/how-to-read-spark-plugs.html
Normally aspirated: Look for a ground strap coloring of tan to light brown and getting darker as it goes to the spark plug ring, center electrode should be again tan-light brown. The crown should be the same with out any specs of aluminum or dark specs all over the center electrode. This will be as close to your timing and Air/fuel you will get.
Drag Racing List - Spark Plug Reading 101 for Gasoline Motors
https://www.draglist.com/artman2/publish/daily_stories/Spark_Plug_Reading_101_for_Gasoline_Motors_1306.shtml
Spark Plug Reading 101 for Gasoline Motors. By Mike Canter . Other than installing thermo-coupler sensors in the combustion chambers the only real way that you know what is happening inside your engine is to read the spark plugs. Both the fuel mixture and the ignition timing result in coloring of the spark plug’s porcelain and ground strap.
Spark Plug Reading 101 by Mike Canter - Dragstuff
https://www.dragstuff.com/techarticles/reading-spark-plugs.html
Another excellent "How to read Spark Plugs" article; Racing Spark Plug Cross Reference for Autolite, NGK and Champion; How you can read spark plugs and select them - by Gordon Jennings (Note: Geared towards Motorcycles but very good info here. Make sure and read the part about how detonation makes the plug look cleaner.)
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