While the original Datsun 610 had a 1770 cc L18 engine, 1974–1976 610s received the larger 2.0-liter L20B engine (as did the Datsun 710 from 1975), although with only (SAE Net). The federalized 2.0 thus produced less than what was claimed for a Japanese market 1.6. California-spec cars have . The federal/Canadian version took leaded fuel and depended on an EGR system for pollution control, while the California cars have a catalytic converter and require unleaded gasoline. Gross horsepower ratings are 110 and 107 respectively. The 1974s also received larger bumpers mounted on hydraulic cylinders to meet new safety standards, increasing weight by about and making the car longer. The additional weight meant performance still suffered moderately (while fuel consumption dropped by about ten percent) from the higher weight and additional emissions equipment.