Re: knock during hard acceleration
Ignition too advanced. Search for the "knee" in the ignition curve. This is the point where there is no increase in rpm with increase in advance one notch but a decrease in rpm with the ignition retarded one notch. Normally you should drive with the ignition retarded one notch from the knee. If cruising down a level highway at a constant speed you can advance the ignition one notch and if driving around town or pulling a grade then retard the timing one notch.
You can find the knee with a fast idle, about 1,500 rpm, or when driving at about 45 mph.
The high compression head needs less advance because the air/fuel burns faster.
If you run the engine with the knocking because it is too advanced, you will ruin the rod bearings.
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