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Old 08-08-2009, 06:50 AM   #11 (permalink)
glb
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Join Date: May 2005
Location: Chester, NJ
Posts: 4,681
IIRC, we must be careful gapping iridium and platinum so as to not disturb those platings? Is this right?

Also, plugs on most cars can be indexed, so the gap faces the intake valve. You need to mark the socket and try various plugs to do this. I have no idea if it helps for real...
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