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Seal them to the valve cover, but not to the head.
BTW, if the covers have breather or PCV baffles in them there is probably still sand in the baffles. The only way to get all the sand out is to cut the baffel out
Thanks for the info and I do believe I got all the sand out as I washed them as well as I could and the sand did come out, but I am off to the store for some gasket seal