pretty stupid question, i know how to build a small block, but i cant tell the difference between rich or lean,im using regular autolights, and i recently installed them about a month ago, i took them out to see if anything was wrong, and at the tip of the spark plug it was shiny black, does this indicated rich or lean, is that dangerous to be shiny black, what can i do to fix it if its a problem. Oh by the way its for the 71 ' duster w/ 340 motor

 

If it was lean, the plugs will be white because of the heat. Black could be rich with soot or it could be oil.

There color is on the insulator only. They should be a light to medium brown.

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87 IROC-Z SuperPro ET Bracket Race Car
461 naturally aspirated Big Block

Best ET on a time slip: 11.242 altitude corrected to 10.89
Best MPH on a time slip: 121.52 altitude corrected to 125.89
Altitude corrected rear wheel HP: 497.9
Best 60 foot: 1.546

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley

 

i forgot but i belive its black oily, so that could indicate that i have a oil problem???