Castings

• The Castings are made of Cast Iron and are prone to rusting. Sometimes they can get very dirty and rusty.
• Bead blasting of castings is the best way to clean them up.
• Passages with flow restriction cause all kinds performance headaches. Passages must be cleaned out. To do so, passage plugs often must be drilled out and later replaced. See Removing and Replacing Brass Passage Plugs. Give the passages special care in cleaning and inspecting. See Fiber Optic Light.
• Occasionally, the taped holes for jets are damaged to the point that they must be repaired. See .
• The mating surfaces of the two carburetor castings must be flat, free of burrs, and not have deep scratches. Use stone to remove any high spots. Scratches can be filled with JB Weld and when hardened sanded flat.
• The upper casting, throttle bushing area must not be worn out of round, causing vacuum leaks. To repair worn throttle bushing hole, use Throttle Shaft Bushing Drill Fixture Plate.
• When cleaning, the casting threads should be chased. See Casting Threads.
• Fuel Inlet port must mate smoothly to fuel line ferrule. See Dremel Stone #911.
• Inspect castings carefully for cracks in castings near Fuel Inlet and GAV.
• Bead blasted castings should be painted with POR-15 Semi-gloss Black paint for compatibility with high temperature and gasoline. Do not apply paint to anything brass or cad plated (i.e. plugs, stop pins).

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