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The short-lived 857 S of 1955 was an attempt to hold off the strong Mercedes-Benz team, something the 750 Monza and 118 LM/121 LM were unable to do. An existing 750 Monza chassis received an enlarged version of Lampredi's four, now displacing 3.4 L (3421 cc/208 in³) and producing 280 hp (209 kW). The car was not competitive with the German team at the 1955 Tourist Trophy, so Lampredi went back to the drawing board for the next season.