The 260Z was sold in the United States for the 1974 model year only, but was available in other countries until 1978. The engine was enlarged .2 L to 2.6 L by lengthening its stroke. In the US, federal emissions regulations forced a reduction in ignition timing and compression ratio, resulting in a lower power output (140 hp) for the 260Z despite the additional displacement, whereas in other countries the power output increased to 165 bhp (123 kW; 167 PS). There was also a 1974.5 model sold through the second half of 1974 in the US that had the full 165 bhp (123 kW; 167 PS) with the addition of the larger 5 mph safety bumpers, that would become the standard for the 280Z.