I hate Champion plugs, years ago when I worked on cars, it was not uncommon to get two bad champion plugs out of a pack of four plugs. Since i started working on boats, I started using NGK. I have never(26 years) run across a single NGK plug that was worn out. I've seen them fouled by gas, oil, and water, but never worn out. If you ever drop a champion plug(non copper core) it usually breaks in half. I've tried to break a NGK and all they would do is break the porcelain off and bend over. Ive run back to back test with Chanpion vs NGK plugs in a 225 looper and made more power with the NGk on a K&O dyno(yes, i know they don't recommend anything but Champion due to electrical interference). Champion plugs rust quick in a salt environment compared to NGK or AC(autolights are the worst about this). Champion plugs run like crap in a 2.4/2.5 merc(run good in a 3.0L).
But even after all this, I'd have to agree that in some motors(mostly OMC) Champion seem to run better. Run the projected tip plug that Ferm recomended
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