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took truck to dealer for heavy greyish smoke and bad knocking at and abouve 1800 rpm while driving.dealer said blown head gasket. the knocking is definately on the drivers side and it sounds like a rod or something while driving. while in park you can rev it up slow and it doesn't knock, but if you rev it up faster it starts the knock at 2500 rpm. im looking for blown head gasket symptoms from others that have had problems. the knocking has me more worried that it could be more then a blown head gasket, i dont know why it would knock. thanks guys