[1] The G.8 was a metal single-bay biplane with fabric covering, a frontal radiator, and a two-bladed propeller.

The trainer version was unarmed and powered by a Hispano-Suiza 8A V8 engine rated at 104 kilowatts (140 horsepower), while the fighter was armed with two 7.7-millimeter (0.303-inch) Vickers machine guns synchronized to fire through the propeller and had a 149-kilowatt (200-horsepower) Hispano Suiza V8.

The G.8bis had a 134-kilowatt (180-horsepower) Hispano-Suiza HS 34 engine driving a two-bladed propeller, and differed from the G.8 in having a longer-span lower wing and radiators attached to the sides of its fuselage over the wing leading edges instead of a frontal radiator.

[4] The Regia Aeronautica (Italian Royal Air Force) did not place a production order for either model of the G.8 or for the G.8bis.

Gabardini retained all the G.8 aircraft for instructional use at its flight training school at Cameri.