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Reading Spark Plugsby Meaux Racing Heads, Last Updated Dec 29, 2014Note: This article was written for naturally aspirated engines, do not use the timing & mixture information for power adder engines. For Power Adder - see Spark Plug Reading 101 This is only valid if you shut-off the engine after the finish line then tow the car back to the pits where you remove the plugs for reading!Or if you are on the dyno.VALID ONLY for full load acceleration or steady state dyno tests.Plugs are best vie …