Hissing noises indicate a vacuum leak. You should be able to pinpoint the leak by spraying some carb cleaner around suspected leaks. You can also listen through a piece of rubber hose used like a stethoscope. Most likely places to leak are intake manifold gasket, carb gasket, crack in manifold, and any vacuum lines that may have come off. If there is a vacuum fitting on the carb, it may have had a cap on it that could have come off. Head gaskets would not normally cause a hissing noise or vacuum leak.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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