Bigblock

Bigblock is a term used primarily in automotive contexts to refer to a family of high-displacement V8 engines built with physically large engine blocks. The designation contrasts with small-block V8 engines and is used to describe engines designed for high torque output and strong overall performance, often at the cost of size, weight, and fuel efficiency. The concept originated in the mid-20th century as manufacturers expanded displacement to boost power for performance, heavy-duty trucks, and industrial applications.

Notable examples span several American manufacturers. Chevrolet introduced its big-block family in 1958, with engines such as the 348, followed by the famous 409, 427, and 454 cubic inch variants. Ford developed the FE family, including the 427 and 428 cubic inch engines, used in performance cars and racing. Chrysler produced large-displacement units in the RB and B-Block line, including the 383 and the 426 Hemi. These engines are characterized by larger bore and stroke, reinforced blocks and crankshafts, and a design emphasis on high torque output.

In practice, big-block engines offered strong performance in muscle cars, trucks, and drag racing, but they typically entailed higher weight, greater space requirements, and lower fuel economy compared with smaller alternatives. In contemporary engineering, the strict distinction between big-block and small-block is less rigid, as modern performance variants and crate engines span a range of displacements. The term endures among enthusiasts and in historical references to classic American V8 powerplants.