Big Block Engine Nitrous Tune Up Spark Plug
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3. Now this spark plug looks like it’s barely ever been run. Note that there’s a very faint gray fuel ring at the base of the porcelain, indicating that the cylinder is running with either an ideal air/fuel ratio or almost on the verge of being lean. Ask ten different tuners if this plug came from a lean cylinder or not and you’ll probably get five different answers. View Related Article
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