Gm casting number on block 10066036 what size is this engine?

The GM casting number 10066036 indicates that the engine is a 5.3L Vortec V8 engine. This engine was produced by General Motors from 1999 to 2015 and was used in a variety of vehicles, including the Chevrolet Silverado, GMC Sierra, and Tahoe. The 5.3L Vortec V8 engine is known for its reliability and durability, and it is capable of producing up to 355 horsepower and 383 lb-ft of torque.