Chevy 5.7 Litre Vortec Specs & Informationby A.J. Andrews
General Motors placed the 5.7 liter L31 Vortec in several of its trucks, including the Chevrolet C/K, the Cadillac Escalade and the GMC Yukon. The L31 was the last engine to come out of the first-generation of Chevy small blocks.
The Vortec generated 255 horsepower at 4,600 rpm and 330 foot-pounds of torque at 2,800 rpm, or the force required to move a vehicle forward. It had a displacement -- the amount of air and fuel exited from an engine during a full cycle --of 5,735 cubic centimeters, and compression ratio -- the maximum engine volume compared to the minimum -- of 9.4 to 1.
The dual overhead cam L31 had a front longitudinal design, two valves per cylinder and required a four bolt intake manifold. Its cylinder heads and block were cast iron, it received fuel through a multi-point fuel injection system and its components were compatible with all smaller engines in the Chevy first- generation small block family.
The Vortec had a four inch bore, also known as cylinder diameter, and a 3.48 inch stroke, or the length a piston moves between top and bottom dead center.
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