The Franklin O-425 (company designation 6AG/6V6) was an American air-cooled aircraft engine that first ran in the mid-1940s.
The engine was of six-cylinder, horizontally-opposed layout and displaced 425 cu in (7 L).
The O-405-13 (6V6-300-D16FT) of 1955 was a vertically mounted, turbocharged and fan cooled version for helicopters.
Data from Aircraft engines of the World 1950.
[1] Comparable engines Related lists