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THIS IS THE MORE COMMON VALVE SPRING SEAT FOUND ON NORTON O.H.V SINGLES 1 9/16" (35.5MM) OUTSIDE DIAMETER. 3/4" (19MM) INSIDE DIAMETER. IT WOULD BE FOUND UPTO THE LATE FIFTIES. THE LATER SMALLER ONE IS ON PART NUMBER 20179 AND IS 1 3/16" (30MM) OUTSIDE DIAMETER WITH A 5/8" (16.1MM) INSIDE DIAMETER.
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