Just changed my plugs tonight since it's been about 2 months and almost 2 bottles...I noticed that the ground electrode looked different on some plugs than it did others. I took a bunch of pics, so if any experts here could tell me what this means, I'd appreciate it.

(Autolite 104s gapped at .035, 100-150 shot retarding 2-3 degrees of timing on spray)

Plug 1 Pic 1
Plug 1 Pic 2

Plug 2 Pic 1
Plug 2 Pic 2

Plug 3 Pic 1
Plug 3 Pic 2

Plug 4 Pic 1
Plug 4 Pic 2

Plug 5 Pic 1
Plug 5 Pic 2

Plug 6 Pic 1
Plug 6 Pic 2

Plug 7 Pic 1
Plug 7 Pic 2

Plug 8 Pic 1
Plug 8 Pic 2

-Matt

 

http://www.4secondsflat.com/Spark_plug_reading.html