The Mercedes-Benz M114 engine is a straight-six Otto cycle engine with dual two-barrel Zenith 35/40 INAT carburetors or with Bosch D-Jetronic fuel injection system. The engine displaced 152.4 cubic inches (2,497 cm3). The engine develops 146 SAE hp, has a maximum speed of 6300 rpm with a 9:1 compression ratio.