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I like the looks of those plugs I don't see any silver or black dots on the center porcyn, I like the looks and color of the ground strap also Especially after several passes with boost at or above 34 degrees Put two new ones back in it and try lowering the timing back to 34 or less and make another run and post some pictures of those new plugs after those runs
How much boost at the upper RPM ? Are you using boost retard at all? And finally what is the mechanical compression ratio and what fuel are you using I feel your pain as far as rising before sunrise at 5:30 AM to go racing, we both must be crazy The prices we racers pay with such stupid grins on are faces

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I don't have pic's of the previous plugs,but they were dark like it was too rich.Put in a fresh set of 8's and made 2 hits and raised the timing from 35 to 37.The e/t & MPH fell off so it seems to like 35*.I did not retard the timing because it misfired/broke up when I did.
until I can test a "9",it seems to fat to me,the 37* cleaned up the plugs over the 35
Any light throttle crusing they come out black