GMC's Big-Block 478 V6 If you're interested in engines, especially big-power American engines, you likely know the term "big block" as it relates to muscle cars and especially V8 engines.

The 478 ci V6 was first introduced by GMC for its massive 6500 Series trucks, though the foundation of the powerplant had ...

General Motors has been putting V6 engines in its cars and trucks for more than 65 years, and its very first ones were members of the truck-only GMC V-6 family.

GM introduced a new family of heavy-duty 60-degree V6 engines with 305 to 478 cubic inches of displacement ... as powerful as the most potent engines GMC has built. However, it produces 630 ...