NGK are good because you have a broad spread tolerance of actual heat range in 1 given heat range plug number.
There is supposedly 130* of tip temperature difference in each heat range on an NGK plug........about the same as any other maker.
Tip temperature is strictly based on the amount of insulation around electrode. Nothing more, nothing less. It's fairly easy to compare heat ranges between brands with your eyes, no cross reference chart needed.
And somebody said you don't read a Champion like an NGK.....really, how is that possible? Mixture is on the porcelain, timing is the strap and heat range is in the threads. How does that possibly change with brands?........answer, it doesn't
