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Reference gapping sparkplugs,
I've been using Bosch Platinum IR Fusion plugs (4503). They have four (I guess you call them electrodes).
They come pre-gapped.
Just my two-cents, I don't like spending money if I don't have to. So for sparkplugs I research them on Pelican Parts and buy them via RockAuto. I paid $49.28 for 8 Bosch Platinum IR Fusion plugs (they are sold in packs of 4 plugs each) last year. But the great part was that I got a rebate check for $32.00 from Bosch as part of their Spark Plug Sparktacular Rebate promotion.
My spark plug change before this last one (2012) I got a Bosch rebate check for $24.00 on Platinum IR Fusion six plugs. The plugs from RockAuto cost me $18.54 with shipping it was $27.69.
Good Luck
MNC-I
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