You nee to bring it down some if your are pinging. What grade of gas are you running?? Run the highest octane when the timing is bumped up. But you should have the timing set anywhere from 10* to 15*, every car is different. Just keep bumping it up until it ping then take it down a couple degrees. Or play with it up & down to you feel the best seat of pants feel without pinging. Start at 10* for a base line and go for there........
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Mike
My 86GT site