Compared to the M48A1 on which it was based, the M67 had a stubbier main armament. This dummy gun tube concealed the flame gun so the flame thrower tanks weren't singled out as targets. The headlight brush guards had flattened tops to allow the tube to clear at its extreme 12° of depression. (Picture from Standard Military Vehicle Characteristic Data Sheets.)
This interesting view shows some details of the flame gun where the barrel cover has been removed. The disc structure would normally house the atomizer nozzle near the top, the main fuel nozzle extension through the large central hole, and the carbon dioxide snuffer outlet near the bottom; however, these are all missing from this vehicle. Note the air holes in the barrel shroud forward of the disc and the engine access doors in the top of the insulated rear deck. (Photo by Richard S. Eshleman.)
Details of the commander's M1 cupola can be seen here. Although the loader's hatch remained, his position was taken up by the flame thrower's fueling and charging controls. Note that the gunner's periscope guard is a different shape compared to the gun tanks. The M67A1 was fitted with the periscopic sight XM30. (Photo by Richard S. Eshleman.)
The heritage of the M48A3 tank can easily be seen in this rear view. The TC's cupola has the vision block adapter ring, and the armored boxes around the taillights and armor along the top of the exhaust grille are present. The flame gun nozzle, which could be either .75" (1.9cm) or .875" (2.22cm) diameter, is sticking out of the dummy gun tube. The removable cover on top of the dummy tube can be seen about halfway down, and the holes for combustion air line the lower portion of the tube.
This M67A2 is being used to fearsome effect. (Picture taken Apr 1966; available from the National Archives.)