An engine that was a development variant of the 4-cylinder M-332 engine. It entered production in 1960 at the Walter works; in 1964 the Avia works took over production, and in 1992 the LOM works followed. It powered the Let L-200 Morava, Zlin Z-526, Zlin Z-726, Zlin Z-43, and Zlin Z-142 aircraft.
| Configuration | 6-cylinder inverted inline |
| Cooling | air |
| Compression ratio | 5.9 |
| Displacement | 6.3 l |
| Weight | 153 kg |
| Maximum power | 210 hp (154.5 kW) at 2750 rpm |
| Nominal power | 170 hp (125 kW) at 2600 rpm |
