What kind of engine does an M37 have?
The M37 uses a 230 cubic inch inline-six gasoline engine with a flathead design. This simple, durable powerplant was chosen for reliability and easy maintenance in rugged military service.
The Dodge M37 is a 3/4-ton military truck produced in the early 1950s. Built on the Power Wagon lineage, it was designed for field service, with a straightforward engine and drivetrain that could be repaired with readily available parts in harsh conditions. The engine’s architecture reflects that mission: robust, simple, and easy to service in the field.
Technical specifications
Below are the core engine specifications that define the M37’s powerplant. The numbers reflect standard configurations and typical field-condition variations.
- Displacement: 230 cubic inches (3.8 liters)
- Configuration: Inline six-cylinder
- Valve arrangement: Flathead (L-head) design
- Induction: Carbureted gasoline engine
- Power output: Approximately 90–95 horsepower
- Torque: Roughly 170–190 lb-ft, depending on build and tuning
Note: The 230 cu in inline-six was a common powerplant in Dodge trucks of that era, favored for its reliability and ease of maintenance in military settings. It was paired with a 4-speed manual transmission and a two-speed transfer case, reinforcing the M37’s off-road capability.
Context and maintenance
The engine’s straightforward design made spare parts widely available and field repairs feasible, which was essential for military use in varied theaters and climates. In practice, owners focus on carburetor upkeep, ignition system maintenance, fuel quality, cooling system integrity, and regular oil changes to keep the M37 running in demanding conditions.
Restoration and parts availability
Today, restoration enthusiasts often source components from Dodge Power Wagon ecosystems or dedicated M37 communities. While some owners opt for modern carburetion or updated ignition systems, many restorers prefer preserving the classic inline-six’s mechanical simplicity to maintain authenticity and ease of maintenance.
Fuel and cooling considerations
Because the engine is carbureted and designed around practical field use, operators pay particular attention to fuel quality, air filtration, radiator cooling, and proper engine timing. Using the recommended fuel grades and maintaining the cooling system helps prevent common issues in hot or dusty environments.
Summary
The Dodge M37’s engine is a 230 cubic inch inline-six, flathead gasoline powerplant—a straightforward, durable design chosen for reliability in military service. Its simplicity and parts availability have helped it endure in restoration and historic operation programs.
Which is better, M37 or G37?
When we compare the Infiniti G37's and the Infiniti M37's specifications and ratings, the Infiniti G37 has the advantage in the area of typical lower range of pricing for one- to five-year-old used cars. The Infiniti M37 has the advantage in the areas of fuel efficiency and interior volume.
What are common problems with the M37?
M37 owners often face engine oil leaks and transmission shifting issues after high mileage.
What engine does a M37 have?
The base M37 features a 3.7-liter, 330-horsepower V6, while the M56 comes equipped with a 5.6-liter, 420-horsepower V8.
What engine is in a Dodge M37?
The standard engine for a Dodge M37 is a 230 cubic inch, 78 horsepower flathead Chrysler straight-6 engine, model T245. This L-head engine was derived from civilian vehicle engines and was known for its durability and torque, rather than high RPM performance. Modifications are common today, with many owners swapping in more modern engines like the Cummins 4BT or GM LS series.
This video shows a 1954 Dodge M37 and its engine: 1mTwo Guys and a RideYouTube · Aug 27, 2025
Original M37 engine
- Type: Flathead (L-head) straight-6
- Displacement: 230 cubic inches (3.8 L)
- Horsepower: 78 bhp at 3200 rpm
- Torque: More torque than horsepower
- Carburetor: Carter ETW-1 downdraft
- Electrical system: 24-volt, using two 12-volt batteries
Common modifications
- Cummins 4BT: A 3.9L, four-cylinder turbo diesel engine that provides significantly more horsepower and torque.
- GM LS series: A popular V8 engine swap that drastically increases power, often resulting in around 300-325 hp.
- Holley carburetor: A common upgrade to improve fuel delivery, sometimes used after a throttle body injection system fails.
This video shows an M37 with a Cummins 4BT engine: 59sTwoGuysGarageYouTube · Nov 15, 2023
