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Big Block V8: All About Size and Displacement
People commonly use this term for engines that are large in both size and displacement. Also, they often were a top of the line option for muscle cars. Most commonly, they use the big block term for those Chevrolet or GM powerplants with displacement at or above 400 cubic inches. However, the big block also designates the specific engine architecture.
In fact, the big block V-8 different from the camshaft in block type they often use on small block engines. But the main feature is the eight-cylinder V-shaped configuration with the cylinders sitting on the crankcase in two sets of four pistons. For the ultimate power, all eight of the pistons drive a common crankshaft.