List of United States Army tactical truck engines

In the late 1930s the US Army began setting requirements for custom built tactical trucks, winning designs would be built in quantity. As demand increased during WWII some standardized designs were built by other manufactures.

Most trucks had gasoline (G) engines until the early 1960s, when multifuel (M) and diesel (D) engines were introduced. Since then diesel fuel has increasingly been used, the last gasoline engine vehicles were built in 1985.

Most engines have been water-cooled with inline (I) cylinders, but V types (V) and opposed (O) engines have also been used. Three air-cooled engines were used in two very light trucks. Gasoline engines up to WWII were often valve in block design (L-head), during the war more overhead valve (ohv) engines were used, and after the war all new engines (except 1 F-head and 1 Overhead camshaft (ohc)) have been ohv. All diesel engines have ohv, they can be naturally aspired, supercharged (SC), or turbocharged (TC).

The same engines have been used in different trucks, and larger trucks often have had different engines during their service life. Because of application and evolution, the same engine often has different power ratings. Ratings are in SAE gross horsepower.

The front of an engine is the fan end, the rear is the flywheel end, right and left are as viewed from the rear, regardless of how the engine is mounted in the vehicle. Engines in the tables are water-cooled and naturally aspirated unless noted.

Kaiser-Jeep Tornado
(front cutaway)
American Motors AV-108-4
(left rear)
American Motors AV-108-4
(right front)
Willys MB
(left side cutaway)

Caterpillar 3116 (left front)
Caterpillar 3116 (right rear)

Chevrolet BV-1001
(left side)
Chevrolet BV-1001
(right side)

Ordnance design LDT-465
(left front)
Ordnance design LDT-465
(right rear)
Continental R22
(left side)
Continental R22
(right side)
Continental R6602
(left side)
Continental R6602
(right side)

Model	Displacement	Fuel	Type	Power	Torque	Used in
6CTA8.3^[5]	504 cu in (8.3 L)	D	TC I6	240 hp (179 kW) @2100rpm	745 lbf⋅ft (1,010 N⋅m) @1500rpm	M939 5-ton 6×6
NH250^[6]	855 cu in (14.0 L)	D	I6	240 hp (179 kW) @2100rpm	560 lbf⋅ft (759 N⋅m) @6500rpm	M809 5-ton 6×6), M939 5-ton 6×6
NTC400^[7]	855 cu in (14.0 L)	D	TC I6	400 hp (298 kW) @2100rpm	1,150 lbf⋅ft (1,559 N⋅m) @1500rpm	M915 series 6×4, 6×6, 8×6
V8-300^[8]	785 cu in (12.9 L)	D	V8	300 hp (224 kW) @3000rpm	580 lbf⋅ft (786 N⋅m) @2100rpm	M123/125 10-ton 6×6

Cummins 6CTA8.3
(left side)
Cummins 6CTA8.3
(right side)
Cummins NH250
(left front)
Cummins NH250
(right rear)
Cummins V8-300
(left front)
Cummins V8-300
(right rear)

Model	Displacement	Fuel	Type	Power	Torque	Used in
3-53	159 cu in (2.6 L)	D	SC I3	103 hp (77 kW) @2800rpm	217 lbf⋅ft (294 N⋅m) @1500rpm	M561 1+1⁄2-ton 6×6 “Gamma-goat”
Series 60	775 cu in (12.7 L)	D	TC I6	400 hp (298 kW) @2100rpm	1,400 lbf⋅ft (1,898 N⋅m) @1200rpm	M915 series 6×4, 6×6, 8×6
8V92TA^[9]	736 cu in (12.1 L)	D	TC V8	450 hp (336 kW)	1,330 lbf⋅ft (1,803 N⋅m) @1200rpm	M911(C-HET) M977(HEMTT), M1070(HET)
12V71	852 cu in (14.0 L)	D	SC V12	600 hp (447 kW) @2500rpm	1,470 lbf⋅ft (1,993 N⋅m) @16000rpm	M746 22+1⁄2-ton 8×8 (HET)

Detroit Diesel Series 60 (left front)
Detroit Diesel Series 60 (right rear)

Model	Displacement	Fuel	Type	Power	Torque	Used in
T-202	201 cu in (3.3 L)	G	I6	79 hp (59 kW) @3000rpm		VC 1⁄2-ton 4×4
T-214-245	230 cu in (3.8 L)	G	I6	92 hp (69 kW) @3200	180 lbf⋅ft (244 N⋅m) @1200rpm	Dodge WC 3⁄4-ton 4×4, M37 3⁄4-ton 4×4
318^[10]	318 cu in (5.2 L)	G	V8	150 hp (112 kW) @4000rpm	230 lbf⋅ft (312 N⋅m) @2400rpm	M880 1+1⁄4-ton 4×4 (CUCV)

Model	Displacement	Fuel	Type	Power	Torque	Used in
GTB	226 cu in (3.7 L)	G	I6	90 hp (67 kW) @3000rpm	180 lbf⋅ft (244 N⋅m) @1200rpm	1+1⁄2-ton 4×4

Model	Displacement	Fuel	Type	Power	Torque	Used in
440	1,090 cu in (17.9 L)	G	I6	240 hp (179 kW) @2000rpm	810 lbf⋅ft (1,098 N⋅m) @1200rpm	M25 Tank Transporter

Hall-Scott 440 (left side)
Hall-Scott 440 (right side)

Hercules DFXE (left side)
Hercules DFXE (right side)
Hercules HXD (left front)
Hercules HXD (right front)
Hercules JXD (right side)
Ordnance design LDT-465
(left front)
Ordnance design LDT-465
(right rear)
Hercules RXC (right side)

Model	Displacement	Fuel	Type	Power	Torque	Used in
GRD-214	214 cu in (3.5 L)	G	I6	85 hp (63 kW) @3400rpm	160 lbf⋅ft (217 N⋅m) @1200	IHC M-1-4 1⁄2-ton 4×4
GRD-233	233 cu in (3.8 L)	G	I6	93 hp (69 kW) @3400	181 lbf⋅ft (245 N⋅m) @800	IHC M-1-4 1⁄2-ton 4×4, IHC M-5-6 1+1⁄2-ton 6×6