Earlier this month, General Motors officially announced the new 6.6L V8 L8T gasoline engine for the 2020 Silverado HD dually and 2020 Sierra HD. Based on GM’s fifth-generation Small Block engine architecture, the iron block motor makes 401 horsepower and 464 pound-feet of torque. But GM is planning an even bigger gasoline V8 engine, according to GM Authority sources familiar with the matter.
Details about the new engine are currently scarce, and we have received conflicting reports on the matter. However, sources from disparate parts of the industry have lined up on two things.
- The 6.6L V-8 L8T is the largest GM gasoline engine “for the time being.” We keep hearing that phrase in different forms and contexts from sources far and wide.
- The displacement of the other engine will be “well over” 8.0 liters.
As it stands, GM would use the future, high-displacement eight-banger in Class 7 trucks, which it is considering co-developing with Navistar – as we were first to report back in November. GM and Navistar have developed a very close relationship over the years, having co-developed the Class 4, 5 and 6 2019 Silverado Medium Duty and International CV chassis cab trucks. In addition, Navistar currently performs contract manufacturing of the cutaway versions of GM’s Chevrolet Express and GMC Savana commercial vans.
Stay tuned to GM Authority for further updates on the rumored new engine and for round-the-clock GM news coverage.