Please help read plugs, 7 good and 1 black?

[Car Lover]

All the above i would check most probably a bad plug wire,by the way 800 cfm double pumper sounds like a lot of carb for a street engine.

[convincor]

Two different sets of wires, same problem.

Originally Posted by Car Lover

All the above i would check most probably a bad plug wire,by the way 800 cfm double pumper sounds like a lot of carb for a street engine.

Originally Posted by garry viohl

I have tried two set of wires, new plug, all same number and heat range and does the same thing. I will try new cap and rotor, they looked ok when I checked them.