2.4.1 Air crossover tube

The early air crossover tube has no vent tube. With the addition of positive crankcase ventilation in February 1943 a vent tube was added which is connected to the late style oil filler via a rubber hose secured with two screw type band clamps. Both styles of crossover tube have a block “ F ” on the upright between the cylinder head and the tube.There is a very small script “ f ” in the flat area on the top of the tube. Finish: Early black gloss enamel, later O.D. when the PCV tube was added. The Air cleaner is connected to the crossover tube with a heavy, black accordion type air hose retained at each end with a two wire hose clamp. A rubber or felt grommet is installed in the round hole in the crossover tube upright. The ignition secondary wires pass through this grommet on their way from the distributor to the spark plugs.

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2.4.2 Carburetor Air Horn

The carburetor air horn is formed of two steel stampings, neatly joined along the perimeter of the horn. There is a small script “ f ” lightly stamped into the top of the air horn. The air horn is finished the same as the crossover tube. The air horn is secured to the crossover tube with a single band-type hose clamp surrounding a slip-on seal. The seal is rubber hose material on early vehicles and felt on rubber shortage vehicles. The air horn is clamped to the carburetor with a special heavy steel band clamp, including a large filister head screw and square nut. The clamp and its hardware are cad plated. There is no seal for the carburetor to air horn interface.

The air cleaner is described in the firewall section.

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