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.
A.J. Andrews' work has appeared in Food and Wine, Fricote and "BBC Good Food." He lives in Europe where he bakes with wild yeast, milks goats for cheese and prepares for the Court of Master Sommeliers level II exam. Andrews received formal training at Le Cordon Bleu.