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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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