General Motors is reportedly developing a new generation of its small block V8 engine, with the sixth generation possibly coming in two sizes. The new engine may be used in the 2027 Chevrolet Silverado, with some outlets suggesting it could include a 350 V8 engine option. However, the exact sizes of the new engines are unclear, with various reports mentioning different displacements, including 5.7L, 6.6L, and 6.7 liters.