Another question about plug color

[meck]

I've always thought that on these older engines, there should be some color on the plugs, light tan being best (I have a Ford 640, 1955). Recently, after doing both carb and ignition work, I put in new plugs. These have now been run several hours. I pulled them today to take a look, and they are snow white. It seems to be running okay, but is that white color a sign of running too lean? Help and thanks.

 

[jtwat]

Can also be a sign of a hot plug. Try going down 1 heat range

 

[Michaels Dad]

It would help to know the brand and number of the plug you are referring to.

 

[meck]

I'm using Autolite 437's. This is the same plug that I have been using for years.

 

[Hobo,NC]

Give the main mixture adjustment a 1/4 turn out after an hour are two check a plug...