Everything You Need to Know About LS, LSX, and Vortec Engines: Specs, History, Swaps, and More. ... This crate engine is rated at 533 hp and 477 lb-ft of torque. Steven Rupp.

A Quick Guide To GM's Ecotec3 5.3L V8 Engine: ... Operation and specs. ... The 5.3-liter Ecotec V8 produces 355 horsepower and 383 pound-feet of torque while providing fuel economy of 23 mpg ...

A member of GM’s latest small-block engine family, the 2014 Silverado and Sierra’s 5.3-liter EcoTec3 V-8 will produce an impressive 355 horsepower and 383 lb-ft of torque.