150-160 hp, four-cylinder, horizontally opposed, air-cooled, piston engine family
| Manufacturer | Lycoming Engines |
| Category | Engines - Piston Engines |
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| Air Res T-131PA Jungmann - Optional O-320-A1A |
| American Champion 7GCAA Citabria Adventure - O-320-B2B |
| American Champion 7GCBC Citabria Explorer - O-320-B2B |
| Australian Aircraft Kits Hornet STOL - O-320-B (Bushman) |
| Bearhawk LSA - O-320 |
| Custom Flight North Star Bushplane - O-320-E3D |
| Dakota Cub Super 18-160 |
| General Avia F22 B - O-320-D2A |
| General Avia F22 R - O-320-D2A |
| Guanyi GA20 - O-320-D2A |
| Just SuperSTOL XL - Optional O-320 |
| Kubicek Irbis - Optional O-320 (Irbis STOL) |
| Murphy Rebel - O-320 |
| NFX Aero GA-7 Cougar - O-320-D1D |
| Piper PA-28 Warrior - O-320-D3G |
| Robin DR401 - O-320-D2A (DR401/160A) |
| Robinson R22 Beta II - O-320-J2A |
| Sinoaustral L160 - O-320 |
| Sinoaustral L162 - O-320 |
| Sport Copter Lightning - Optional O-320 (Lightning XS) |
| Van's RV-3 - O-320-D1A |
| Van's RV-8 - Optional O-320 |
| Vulcanair V1.150L - O-320-E2A |
| Vulcanair V1.CL - O-320-H2AD |
