Jacobs L-4 R-755 Radial Engine Specifications:

Number of Cylinders : 7 cylinder air cooled radial gas engine
Displacement: 757 ci
Bore: 5.25 inches
Stroke: 5.0 inches
Compression Ratio: 6.0:1
Aspiraton: Single Stromberg NA-R7A carburetor, 73 octane fuel requirement
Weight: 506lbs
Length: 27.25 inches
Diameter: 44 inches
Output: 255hp
First Flight : 1933
Airframes used on: Beechcraft Staggerwing, Boeing Stearman 75, Cessna Crane, Grumman Ag Cat, Waco CG 15, Waco YKC
Cost: $