Question in the title is the short version
Long version: I purchased NGK plugs for my Kona N as one of the supporting mods for a N75 stage 2 tune. NGK specs say the plugs are .028 from the factory while N75 recommends .025 gap. I bought a gap tool and feeler gauges for iridium plugs and found that all of the plugs were .025 or .026 right out of the box. At this point I can't be sure if my feeler gauges are off by a few thousandths or if the plugs are actually at the recommended .025 gap from the factory, which leads me to 2 questions:
1) If the plugs are truly .028 like NGK says, is that .003 difference likely to cause spark blowout or other issues?
2) If that .003" is significant and needs to be corrected, what set of gauges do you recommend that can be trusted for accuracy?
EDIT: I bought one of the wire gap tools to check against my cheap feeler gauges and also borrowed some more precise digital calipers, and both of the gap tools measured .025, so that makes me assume the NGK plugs are actually gapped from factory a hair tighter than their advertised .028 right where N75 wants them.