detonation?
I haven't had any personal experience with what you are having. Sounds like detonation though.
Do you have pictures of the plugs available for the web?
Sounds like you might have to go to a colder range.
What is your timing at?
Pictures would really help too, there are several smart guys on this site who can tell you much more info than I can.
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1988 GT Convertible
331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta...
One week with new motor, two speeding tickets...joy
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