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John Goreham Contributing Writer, GM-Trucks.com 4-4-2018 Chevy wants you work truck shoppers to know that the new 2019 4500HD/5500HD/6500HD trucks now come with a flowtie. A flowtie is a Chevy bowtie emblem that allows air to pass through and thus cool the engine area. Chevy says that during Z/28 aerodynamics testing, engineers noticed that the bowtie on the grille was blocking cooling air. Engineer Richard Quinn went at the bowtie with a cut-off wheel making slots. He installed the new prototype "flowtie" on the grille and a retest proved that it allowed more air into the engine, lowering engine fluid temperatures during extended track sessions. Now your work truck can have that same benefit. Chevy work truck Design Manager Kevin O’Donnell says, “The flowtie is an elegant solution. And it’s going to work on the Silverado exactly the way it does on Camaro."