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Bad on me . I thought I was running auto lite. 3924. Nope. I using the ngk zfr6f-11g. also referred to as the 6987 NGK. I probably did this based on what Andy finkbeiner uses and recommends. These plugs have been through a bit. Some of my amateur mistakes were a leaking vacuum at the intake and a bolt on O2 sensor that leaks and caused the motor to run incorrectly. Finally, I ran the drag strip with plug wires 7 and 8 loose or disconnected. and burnt the 6 plug wire on the headers. Man, this feels like going to confession revealing all my failures. BUT, the reason I tell all of this is that I have learned a lot along the journey the past couple years and hopefully, I have corrected everything.
My question now is, Would you run them as is or buy some new ones? I don't know how to read the plugs to know if they are ok.
I did buy some plug insulators, fixed the wires, the 02 sensor was welded and the intake does not leak anymore.
