Here is a SINGLE NOS New Original Ford INTAKE VALVE for a 1978 1979 1980 1981 1982 F100 F250 F350 Truck and BRONCO with a 351M 400 5.8L 6.6L V8 engine. This is new in the Ford package with part number D9TZ-6507-A.  It has the .3423" stem size which is different than the 1977 and older engines and it will NOT fit a 351W. You can't beat new original Ford parts.  If you have any questions please ask. Thank-you for looking. (MiddleRoomValves071923)