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I pulled my spark plugs out of my car today and found this. The plugs have about 4000 miles on them.
Each was gapped at about 0.022. How would you diagnose the condition of these plugs?
I replaced them with new NGK plugs gapped at 0.035
the car has a Crane XR700 optical ignition system, Bosch red coil.
Engine is a rebuilt tii motor with 9.5 CR pistons, 32/36 carb, vacuum advance dizzy
feedback appreciated
thanks
dave