Allison V-3420

V-3420
Allison V-3420 Engine
Type Liquid-cooled W-24 piston engine
National origin United States
Manufacturer Allison Engine Company
First run 1937
Major applications Fisher P-75 Eagle
Number built 150[citation needed]
Developed from Allison V-1710

The Allison V-3420 was a large experimental piston aircraft engine, designed in 1937 by the American Allison Engine Company.