When GM first announced its new 6.6L V8 L8T gasoline engine for the 2020 Chevrolet Silverado HD and 2020 GMC Sierra HD, we wondered whether the automaker will offer the new motor on its Silverado Medium Duty Trucks. And now, we have some details regarding when that will happen.
According to sources familiar with the future product plans of GM and Navistar, which developed the Class 4, 5 and 6 trucks in conjunction with GM, the Silverado Medium Duty Chassis Cab trucks will get a gasoline engine option in the very near future. This will also be the case for the International CV, which is Navistar’s version of the truck.
The gasoline engine in question will be a variant of the 6.6L V8 L8T motor debuted on GM’s 2500HD and 3500 trucks. In those applications, the naturally-aspirated eight-cylinder makes an SAE-certified 401 horsepower at 5200 RPM and 464 pound-feet of torque, while being mated to GM’s heavy-duty 6-speed 6L90 automatic transmission.
We hear that the variant of the motor planned for the Silverado Medium Duty will make slightly less horsepower and torque when compared to the Silverado/Sierra HD trucks.
Exact timing for the introduction of the gasoline engine wasn’t clear, but we’ve told be sources to expect it either for the 2020i (2020 interim) or for the 2021 model years, with the 2020i being slightly more likely.
A gasoline engine option on the Silverado Medium Duty line, which includes the Class 4 Silverado 4500HD, Class 5 Silverado 5500HD and Class 6 Silverado 6500HD, would expand the trucks’ powertrain range, which is currently offered exclusively with GM’s 6.6L Turbo-Diesel V8 L5D. The Duramax engine is rated at 350 horsepower and 700 pound-feet of torque, while the L5P Duramax on which it’s based and which is included in the 2020 Silverado HD and Sierra HD is rated at a more potent 445 horsepower and at 2800 RPM and 910 pound-feet of torque at 1600 rpm.