Ford Focus Forum, Ford Focus ST Forum - View Single Post - indexing and filing spark plugs
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Old 06-11-2013, 09:36 AM   #2
Roadworthy
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Location: Edmonton, Canada
What I Drive: 2012 SGM MK3 Titanium

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Been there done that :P

Can't really index the plugs properly without inserts and an different plug length. I did file down my original plugs to be side firing and maybe it helped, but hard to tell. Seemed to fire about the same.
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