Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - View Single Post - indexing and filing spark plugs
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Old 06-11-2013, 11:52 AM   #6
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The reason for indexing Spk Plugs is to locate the wire of the plug so the dome on the piston would not hit it , then some one got the idea this should be done on all engines , like most things people put to much thought into turns out the only reason to index a plug is to keep it away from dome pistons

If you want to expose more of the kernal (which is the theory behind indexing) then us the Autolite AR series plugs these give you the fastest kernel growth and exposure then any other plugs

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