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**Grumpy old man** · 02-01-2016, 11:07 PM

Sparkplugs will only give back what the installer gives them ...INDEXING.. other than that you could run 8 different brands of the same heat range and not see a difference .

02-01-2016, 11:07 PM	#7
Grumpy old man Senior Member Join Date: Dec 2013 Location: Gods country East,Tn Posts: 8,545	Re: Yet Another Spark Plug Question Sparkplugs will only give back what the installer gives them ...INDEXING.. other than that you could run 8 different brands of the same heat range and not see a difference .