Lycoming O-435

O-435
TypePiston tank and aircraft engine
National originUnited States
ManufacturerLycoming Engines
First run1939
Major applications
Manufactured1942–1975 out of production
Developed fromLycoming O-290

The Lycoming O-435 is an American six-cylinder, horizontally opposed, internal combustion aircraft engine. Used on both fixed-wing airplanes and helicopters, the engine is a six-cylinder version of the four-cylinder Lycoming O-290.