Chrysler expects the upgraded engines will see a 20 to 30 percent improvement in fuel consumption, and a 10 percent increase in power.
The updated four-cylinder engines are expected to appear in new models from next year, including the company's 2.0 litre and 2.4 litre engines.
According to Fiat, adding MultiAir technology to the Sebring's 2.4 litre four-cylinder would see a boost in power from 129kW to 141kW, with low-end torque improving by around 15 percent.
Fiat and Chrysler CEO, Sergio Marchionne, said last year that Chrysler internally describes the MultiAir technology as "variable valve timing on steroids", adding that any car utilising it will have "the lungs of an athlete".
Chrysler confirmed in December that it would initially build Fiat's 1.4 litre FIRE MultiAir engine for North American versions of the Fiat 500, before adapting the technology to its own small engines.