Lycoming Families of
Horizontally-Opposed Aircraft Engines

			Manufacturer's Designation
			[Year of First Certification or Test]
Bore	Stroke	Displacement/Cylinder
inches	inches	cubic inches	2 cylinders	4 cylinders	6 cylinders	8 cylinders	12 cylinders
3.6250	3.500	36.12		O-145
				[1938]
4.3750	3.875	58.25		O-235	O-350
				[1940]	[1941]
4.8750	3.875	72.33		O-290	O-435	O-580(8)
				[1942]	[1942]	[1948]
5.1250	3.875	79.94	O-160	O-320	O-480
			[1986]	[1953]	[1954]
5.1250	4.125	85.09		O-340
				[1954]
5.1250	4.375	90.25		O-360	O-540	O-720
				[1955]	[1957]	[1961]
					O-541
					[1965]
5.319	4.375	97.21		O-390	O-580(6)	O-780
				[2002]	[1998]	[2006]
5.2500	4.750	102.83					O-1230
							[1938]