reading sparkplugs

[redsnapper386]

guy's, checked my plugs,and found that all 8- plugs are black powder in color. any clues for the cause . i assume too rich adjustment, but what else can i check. this is on a 1987 5.7 holley 4-bbl 270 h.p.thanks.

 

[Bt Doctur]

The choke for proper operation

 

[chiefalen]

Spark Plugs