Shovelhead oil lines in jugs
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Those are top end oil return lines. Most often they are used on motors with big bore cylinders, where the cylinders do not have oil return passages like the factory H-D cylinders and S&S cylinders do. An advantage of using the external oil return lines is that the return oil does not pass through the head gasket, where there is the possibility that return oil will get into the combustion chamber because of a failed gasket.
Jim -
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