This steel plug has 1/8 NPT pipe threads and a hex recess. This plug is used to plug just one or two holes in the FF1600 engine block. The factory hole is located between the motor mount bosses on the carburetor side of the block. You may also find that the original dipstick hole (near the bellhousing flange, on the carburetor side) has been tapped to accept this plug. Sold individually.
Note: Because of variations in the preparation of these blocks over the years, one or both of these ports may be filled with something other than a pipe plug.