autolites or Motorcraft plugs?
 

i was wondering what is prefered between plugs? motorcrafts or autolites?I was running the AC DELCO rapid fires and I burn them up within the first hard run i make. I am going to the track friday and want to make a good showing. also is the gap .48 thousandths?

Ever heard of Denso iridium plugs? Saw an advertisement in MM&FF, gonna try them with my new 331. But until then, I run the autolites with my setup and they have lasted well over 50 passes with no sign of wear or weakness.

I use NGK plugs and they run great for me. I have made many, many passes on a set and no problems. I run a MSD6AL and blaster coil with accel cap & rotor and accel 8mm wires. I use them in my car and my truck.

what number autolites do you run?

well being out here in the middle east I can't remember exactly at this point but, they are 23XX somethings, they are the longer thread ones though to fit my TW heads, so they may not work for everyone. Good luck

Re: autolites or Motorcraft plugs?
 

I believe the stock spark plug gap on a '87-'93 should be .054.

what number is it for the autolites?

As you were, they are 3924's.