Inlet or exhaust valve, suit Norton SV Model 1 (Big 4) 1933-38, 1939-1944 and WD and 16H (V141 + V29) 1933-38, 1939-1954 and WD, made in UK. Length: 5-14" Head dia: 1-5/8" stem dia: 0.338". Original part numbers: 8934; A2/141 - valve only (inlet or exhaust)