Model Variants (Including Prototypes)
B-34 - Fitted with R-1820-31 radial piston engines of 2,000 horsepower; based on Lockheed Model 137; 200 examples produced.
B-34A - Venturas requisitioned from RAF by the USAAF.
B-34B - Navigational Trainers; conversions from B-34A production models.
O-56 - Initial Designation of B-37; based on Lockheed Model 437.
B-37 - USAAF model; fitted with R-2600-13 radial piston engines of 2,000 horsepower' later redesignated to RB-37.
RB-37 - USAAF redesignation of B-37 production model.
PV-1 - USN designation of B-34; 1,600 examples produced.
PV-1P - Based on PV-1 production models; fitted with camera equipment.
PV-2 "Harpoon" - Revised Ventura; enlarged vertical tail fin and wing surface area; 470 examples produced.
PV-2C - Crew Trainer; based on the PV-2 production model; 30 examples produced.
PV-2D - Based on the PV-2; fitted with 8 x 12.7mm machine guns in nose; 35 examples produced.
PV-2T - Crew Trainer; based on the PV-2 production model.
PV-3 - USN requisition of 27 RAF Ventura II models.
Ventura Mk I - British designation; fitted with R-2800-S1A4-G radial piston engines; 188 examples produced; later redesignated to Ventura GR.Mk I.
Ventura Mk II - British designation; fitted with R-2800-31 radial piston engines; 487 examples produced.
Ventura Mk IIA - British designation of B-34
Ventura Mk V - British designation of PV-1; later redesignated to Ventura V.
Ventura GR.Mk I - Redesignation of Ventura Mk I
Ventura GR.V - Redesignation of Ventura V