The 12Z, designated Type 89 by the company, was the final production evolution of the series of Hispano-Suiza V-12 aircraft engines.

After the initial prototypes, fuel injectors built by Lavalette-Bosch would replace the original carburetors, raising the power from 1,000 to 1,300 hp (750 to 970 kW) at sea level.

The engine continued to use a single-stage, single-speed centrifugal supercharger and therefore lacked the all-altitude performance of German and British designs.

Small prototype runs started in 1939, and were fitted to the French Air Force's front-line fighter aircraft, the M.S.410 and D.520, creating the M.S.450 and D.524 respectively.

In 1943, La Hispano-Suiza received an order for 120 engines from the Spanish Air Force, but by late 1947 only 50 were completed.