Diesel Power - - Contents -

THE CHEVRO­LET Sil­ver­ado 4500, 5500, and 6500 heavy-duty pick­ups now fea­ture the race-style “flowtie” grille, which is the same de­sign found on the ’18 Ca­maro ZL1. The race-her­itage em­blem is the same fa­mil­iar bow tie, but the cen­ter has been left out to in­crease en­gine air­flow for bet­ter per­for­mance. Chevy ex­plains the flowtie back­story thusly: “Dur­ing Z/28 aero­dy­nam­ics test­ing, en­gi­neers no­ticed the bow tie on the grille was dis­plac­ing air away from the ra­di­a­tor, which can im­pact en­gine cool­ing. So, propul­sions en­gi­neer Richard Quinn took a cut-off wheel to the bow tie’s gold fill, leav­ing the sil­ver out­line in­tact. He in­stalled the pro­to­type flowtie on the grille and a retest re­vealed it al­lowed more air into the en­gine, low­er­ing en­gine-fluid tem­per­a­tures dur­ing ex­tended track ses­sions. The con­ven­tional-cab Sil­ver­a­dos are heavy-duty-cy­cle trucks, and the de­sign­ers needed a so­lu­tion that al­lows for max­i­mum air­flow with the truck’s pumpedup grille. They found their so­lu­tion in the per­for­mance-car tool­box.”

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