Here are the only specs I can find:
Two Stage, Cast Iron, Compressor Pump, 5 HP, 17.1 CFM Maximum Free Air Flow At 175 PSI Maximum, 2 Cylinder, Oil Capacity 2 Quarts, Pump Speed 685 RPM, Bore Size 4 3/4 x 2 1/2 Inches, Stroke 3 Inches, Motor Sheave Diameter 6.75 Inches, Flywheel Diameter 16 1/2...