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GS -vs- L/LS Spark Plugs?
NGK Iridium IX plugs :: ZFR6FIX-11 (GS) or BKR6EIX-11 (L/LS)
After doing a search on NGK's web, the GS has a different part number and after looking at the 2 different plugs close up, I notice that the ZFR has an extended spark tip(the ceramic and the electrode, around 1-1.5mm taller) -vs- the BKR. The ZFR's are rated for the GS while the BKR's are for the L/LS.
Has anyone used the ZFR's on a non-GS? When talking with the local parts store guy, he thought maybe the longer projected-tip on the GS-rated plugs may help boost performance since it's closer to to the piston head. To give him some credit, he admitted it was just a guess.
Can anyone shed some light?
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