Bypass hose for LA block with Magnum intake
The bypass kinda relieves the "shock" of cold cooolant coming in whne the Tstat opens, plus, keeps the engine at a more constant temp. Sorta kinda the same thing as the heater dumping into the lower radiator hose/pump suction like on the industrial engines and diesels. When the Tstat is full open, the bypass is just dead space.