What is the standard piston size on a 350?

The standard piston size for a small-block 350 cubic inch (5.7L) Chevrolet engine typically has a bore diameter of 4.000 inches. The stroke of the engine is 3.48 inches, which contributes to its displacement. Piston sizes can vary based on the specific engine configuration and modifications, but 4.000 inches is the common measurement for standard applications.