Reading Spark Plugs
They are tr6's. The necks look really good. On the porcelain it is about 1/3 grey is black and the rest is off white to tan. On the one I cut it is about the same maybe 1/2 and 1/2. At the base of the porcelain it is pretty black.
I have a 2002 RCSB with a 408. Spraying a 200 shot on a stand alone with 116 in it. The plugs have about 1k to 1,200 miles and 4 -5 sprays on them.
I know you can't get a good idea without pics but I described it the best I know how.



