Originally Posted By: D189379
I've never noticed even the slightest performance difference between spark plug brands.
Anyone who says they received a real, significant, gain in power from swapping plugs is fooling thesmelves. You can get a few ponies by indexing your plugs, or messing with heat ranges, to optimize your ignition but it isn't actually the plugs( ie; brand/design/etc.. )doing it. The power comes from the total sum of optimizing your ignition system.
What someone who claims they saw a power increase really saw was a return to normal performance replacing old worn plugs with new properly gapped plugs, or smoother operation from a more efficient plug which made it feel like a power gain, but they didn't gain real, significant, power. These ad's claiming all these outrageous HP gains because a plug has this or that special design, runs a special alloy core that cost a bajillion dollars, etc... is just plain hooey.
What you can see is a smoother idle, slightly better/smoother acceleration, and longer plug life from a plug constructed to a higher manufacturing standard and that uses higher quality components. Champion plugs are flat out junk. They are made cheaply and they perform the same. NGK plugs are made to higher standards with better components and thus they last longer and "perform better" even though that does not mean a power increase.
Just my 2 pennies.
Oh, and btw, I haven't seen anyone mention Accel spark plugs. When offered for your application( not offered for everything )they are some pretty good plugs. I have always had good luck with them, especially in my MOPAR muscle cars, over the years. Wish I could get some to try in my HEMI to replace the OE [censored] Champions but they don't make them.
