230-260 hp, six-cylinder, horizontally opposed, air-cooled piston engine family
| Manufacturer | ●●●●●●●●●● Why is this obscured?  |
| Category | Engines - Piston Engines |
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| Bearhawk LSA - O-540 |
| BNG BN2 Project Fresson - O-540-E4C5 |
| Dream Tundra - O-540-B4B5 |
| Laviasa PA-25 Puelche I - O-540-B2C5/G1A5/G2A5 |
| Laviasa PA-25-235 - O-540-B4B5 |
| Maule M-7-235 - Optional O-540-J1A5D |
| Maule M-7-235 Super Rocket - O-540-B4B5/J1A5D/J3A5 |
| Mven Fermer MVEN-2 - O-540-B4B5 |
| Robinson R44 Cadet - O-540-F1B5 |
| Robinson R44 Raven I - O-540-F1B5 |
| Steen Skybolt D - O-540 |
| Zlin Z 143 L - O-540-J3A5 |
