Originally Posted By Monte_Smith
Originally Posted By rb446
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
I think the NGK's are easier to read heat range because of the lighter color of the threaded body as opposed to the dark color of the autolites, at least it is with my old blind eye's because I pick up the contrast easier.

Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.