I have to agree w/those who mentioned shaving the head. Machine shops will sometimes forget to hone out the cylinder domes after the head shaving, which in turn increases the compression. If this is your case, the only way to get rid of the pinging is to remove the head again and have the domes honed. (We are assuming that you have an OE head gasket w/correct thickness).
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Don't Chrome them; polish them
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