Spark plug heat range

[Billy C]

I have these spark plugs.
3x Champion
w16y Champion
tt10 Motorcraft
c16c Champion
w18 Champion
3076 Autolite
Can anyone tell me their heat range order from hot to cold?

 

[Gary WA]

I have these spark plugs.
3x Champion
w16y Champion
tt10 Motorcraft
c16c Champion
w18 Champion
3076 Autolite
Can anyone tell me their heat range order from hot to cold?

this work?

 

[nkaminar]

There is a good article about spark plug heat ratings in the latest issue of the Model A News.