Quote:
Originally Posted by R4DG
i called NGK after a customer broke his tip and i asked them yes or no to gap, and they said that all the spark plugs produced are factory gap but that does not mean factory gap is for ALL the engines the spark plug covers so its best if you do gap them
call NGK yourself
"Customer Service
hours: 8:30am - 6:00pm Monday-Friday EST
tel: 1-877-473-6767 prompt #1
Technical Support
hours: 8:30am - 5:00pm Monday-Friday EST
tel: 1-877-473-6767 prompt #2"
like i said, use a needle nose pliers and adjust the ground and dont use the circular tool to see what the gap is, use the gapping tool with the rings
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I could be wrong since I haven't done plugs on my Si yet but on the Densos and NGKs I've used they have all been factory gapped within spec for the engine. Gone are the days when you went to your local auto parts store and there were 6 different plug choices and you gapped them to spec. Plugs are specifically engineered for your car and if you're using the part number spec'ed for the car with modern high performance plugs, they should be correctly set from the factory.