HP400RW- no question is stupid bro, were all learning. NO you do not have to drain the oil to replace the valve cover gaskets. You should be able to do it in about an hour and a half - 2 hours. Just have to remove the upper take and remove some hoses to get the the valve covers. Make sure you use a good gasket silicone like Permatex Blue Copper RTV Silicone. Make sure you clean the surfaces real well and then put everything back together. Good luck, let us know if you need more help.
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