The Chevrolet Performance 5.3L /327HP High Output Engine continues the tradition of great small-block V8 engines! The 5.3L LS engine has been one of the most popular GM has ever built. It's been installed in millions of GM-built pickups, work trucks, vans, and SUVs. But, leave it to the Chevrolet Performance engineers to go one step further and upgrade the 5.3L LS. The result is a High Output 5.3 that is just as capable serving as a workhorse; it's just a little bit more fun with 327 horsepower and 347 ft/lbs of torque!