Exhaust valve guides are USA made and come in various sizes for Big twins 1948-1979.
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18181-48 Standard = .566 OD
18183-48 (.002) oversized = .568 OD
18187-51 (.004) oversized = .570 OD
18193-51 (.006) oversized = .572 OD
18194-51 (.008) oversized = .574 OD
181954-51X (.010) oversized = .576 OD
HD New#:18188-48, 18189-48, 18191-48, 18192-48







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