In the case of GM’s new 6.6-liter L78 V8, bigger definitely isn’t better. Its newborn smaller sibling, the 5.7-liter L76 V8, manages to pull almost two tons more than its big brother. Alongside the new Chevy Silverado 1500, the redesigned 2027 GMC Sierra 1500 offers the new engines, both of which belong to GM’s new sixth-gen LS-based Small-Block V8 engine family.
Â
