Desensitizing GM knock sensors

[dhardin at ovec.com]

20 degrees of timing sounds high.  My old 68 GTO (10.75:1 CR with 87 octane,
stock engine) pulls the timing down to about 5 or 6 degrees under load with a
max of about 20 total at light load and still pings.  I'd go by the ping don't
ignore it.


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