The Model J's straight-eight was based on the company's successful racing engines of the 1920s; designed by Duesenberg, they were manufactured by Lycoming, another company owned by Cord. In unsupercharged form, the eight produced an impressive (for the period) , aided by dual overhead camshafts and four valves per cylinder. The Model J was capable of a top speed of , and in second gear. Other cars featured larger-displacement engines, but none surpassed its power. It was also both the fastest and most expensive American automobile in the market.