You dont read a Champion like an NGK. The Champions are way easier to read, and the heat ranges make sense.

If you had an issue with a spark plug, it's YOU not the plug.

Also, cross reference charts are WORTHLESS. Use the book from the plug manufacturer you are going to use. Don't use a cross reference to select heat range.

Havn`t used Chumpeons for years and love NGK`s and they are easier to read. What comp are you at w/the 7`s cos I run those or 8`s at 12.1.1..........

I was only at 10:1 with the 440, ran better for me at around .032 gap with the MSD on both motors.

I ran the 7`s for my sig et and was goin lean up top due to a crappy tune on my part but the 7`s are nice and clean but have 8`s now to mess w/then off to Irwindale for some 1/8th mile fun.............

I have been using Autolite for years ,Autolite 86 A Hot Plug With good luck !!!!

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.

Well you may be correct on the 130* temp, but as I said they worked much better on the 10:1SCR 340/440 cars I ran, NGK 6's (340) and then 7's (440) always came out more or less looking right thats with a good mph tune, perhaps a few sizes over the top on the jets?, but thats how we used to run it back then, a bit on the rich side, the equivalent champs showed a lot different picture and going colder just made them foul on the same tune as with NGK's.

He is an example for you.

If you are using blown alcohol and Champions, I want to see the top of the case has 3/4 to all the way around from the ground wire buring off the coating. On an NGK, they want 3 THREADS DOWN. Do that ona Champion and it will back side pistons and all other bad stuff.

So the opposite is true. If you only take the top of the cad (or whatever plating the [censored] use) off the plug it will be too cold.

For N/A I like to see the top thread gone on a Champion. That's almost 4 on the NGK.

On top of that, the heat ranges are too wide, which some on here think is ideal. I do not.