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I just checked my early parts book and saw the washers. I have never pulled a head, even Atlas, G15, or P11 and found washers on the exhaust port head studs. I guess no one put them back so the factory eliminated them! In any event, if you really want a washer there, pommie john's idea of grease to hold it on the end of the nut is a good one. I always run a die (3/8-26) over these studs to clean the threads before putting the head back on. It sometimes makes it easier to start the nut. I use a thin ring spanner and hold the nut against the stud with the tip of a finger while turning with the spanner.