New Details: GM Unveils New Duramax 8.3L Turbo-Diesel V8 for 2027 Heavy-Duty Trucks
General Motors is replacing its long-running licensed Duramax diesel with an all-new, clean-sheet 8.3L turbodiesel V8 of its own design for the 2027 Chevrolet Silverado HD and GMC Sierra HD, both expected at U.S. dealers beginning…



