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The LS4 is a performance-focused eight-cylinder motor produced by General Motors and is used, as of 2010, in cars such as the Chevy Impala SS, Monte Carlo SS, and Pontiac Grand Prix GXP. The LS4 motor is a part of GM's "LS" line of motors. Modified throughout the years since its initial introduction in the 1970's, the LS4 continues to be used in modern GM sports cars.
Technical Specs
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Sized at 5.3 liters, the LS4 is a small block V-8 engine with a 325 cubic inch displacement. Its compression ratio is 10:1 and it features two valves per cylinder which utilize hydraulic rollers as lifters. The motor's respective bore and stroke are 96 and 92 mm.
Power Specs
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The LS4 generates 303 horsepower at 4,400 rpm and 323 ft-lb of torque at 4,400 rpm. Power levels of the LS4 have been certified by the SAE. Its maximum rpm level is 6,100 rpm. The standalone engine weight of the LS4 is reported at 478 lb, exclusive of any accessory pumps.
Engine Material Specs
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The small block engine is made of cast aluminum as is the cylinder head. The intake manifold is constructed of a steel and aluminum composite metal while the exhaust manifold is compose of fast nodular iron. The engine's camshaft is made of hollow steel while its connecting rods are composed of powder metal.
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