A new 340 cu. in. V-8 engine for use in the Plymouth Barracuda and Dodge Dart automobiles is described. This engine, with increased displacement and power, is approximately the same size and weight as its predecessor, the 273 cu. in. 4-barrel engine. This paper describes the evolution of the 273 to the 340 and the features and modifications making the increased displacement feasible and those changes which were made to utilize the increased displacement to make the 340 a high speed, high output passenger car engine.