The standard engine in all 2025 Silverado HDs is GM's L8T gasoline V8. There are no turbochargers, no overhead cams, just 6.6 liters of old-school, naturally aspirated, pushrod V8 muscle — with ...

and it's within that range you'll find options for the 6.6-liter Duramax diesel engine. Like GM, Ford only provides its powerful diesel engine option, the 6.7-liter Power Stroke, for its heavy ...