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See if you can add a knock sensor to the management system it would just go into one of the freeze plug locations. That way you will be able to see the knock and adjust from there.
My 03 GrandPrix I will see 50degrees in low loads cruising that is the ECU max but during that time EGR is running adding timing also I think that the spark table calls for a max of 42ish I would have to look at my tune.
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