Description

Specifications

The 5.3 LS engine, popularly known as the GM 5.3L V8, is part of General Motors’ LS small-block engine family and is widely recognized for its balance of power, durability, and efficiency. It typically features a 5.3-liter (325 cu in) displacement, aluminum or cast-iron block (depending on the version), and aluminum cylinder heads with 2 valves per cylinder. Most 5.3 LS engines come with a 96 mm bore and 92 mm stroke, sequential fuel injection, and a compression ratio ranging from 9.5:1 to 10.1:1.

Power output varies by model year and variant, generally producing 285–355 horsepower and 305–383 lb-ft of torque. Many versions include Active Fuel Management (AFM) and Variable Valve Timing (VVT) for improved fuel economy and performance. Known for its reliability and upgrade potential, the 5.3 LS engine is a popular choice for trucks, SUVs, and performance swaps.