aslong as you are running 93 octane or whatever the highest octane is were your at and you 100% sure your not getting any octane ping under load then your fine at 15*. Iv had buddies take it to 17 before with no octane ping.
ALso as staed the 10* to the left or would be down side on the balanced would be 10* retared and actuall 20* retarded from factory advancement
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88 gt...17" cobras, cammed 306
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