A Powerful Option for Your Next Vehicle
The 273 Dodge engine is a small-block V8 that left a lasting mark on automotive history. Known for its strong performance, durability, and engineering precision, it became a favorite among classic car enthusiasts and mechanics alike. Whether you’re restoring a vintage Dodge or simply fascinated by legendary American engines, the 273 Dodge engine offers an ideal blend of power and reliability.
Introduction to the 273 Dodge Engine
When Chrysler introduced the 273 cubic inch V8 engine in 1964, it represented a new era of compact yet powerful motors. Designed as part of the LA (Lightweight A-engine) family, the 273 offered excellent balance between horsepower and fuel efficiency — qualities that appealed to a wide range of drivers.
The engine was featured in several Dodge and Plymouth vehicles, quickly gaining a reputation for smooth performance and easy maintenance. Even today, decades later, enthusiasts consider it a valuable option for restorations and performance builds.
The History and Development of the 273 Dodge Engine
The 273 Dodge engine was Chrysler’s first small-block engine in the LA series. Built to replace the older 318 poly engine, the 273 was lighter, more compact, and more efficient. Its cast-iron block and heads provided strength, while its small bore and short stroke design gave it quick revving ability.
By 1965, Dodge introduced a high-performance (Commando) version of the 273, which included a four-barrel carburetor and higher compression ratio. This boosted horsepower from 180 to 235, giving drivers an impressive power-to-weight ratio for the time.
Key Specifications of the 273 Dodge Engine
Understanding the specs helps appreciate what made the 273 such a powerful small-block engine.
- Displacement: 273 cubic inches (4.5 liters)
- Bore x Stroke: 3.625 in × 3.31 in
- Horsepower: 180 hp (2-barrel) / 235 hp (4-barrel Commando)
- Compression Ratio: 8.8:1 (standard), 10.5:1 (high-performance)
- Fuel System: 2-barrel or 4-barrel carburetor
- Block Material: Cast iron
- Valvetrain: Overhead valve (OHV), hydraulic lifters
These numbers show that the 273 wasn’t just a small engine — it was a compact powerhouse built with precision and performance in mind.
Why the 273 Dodge Engine Was Special
Lightweight and Efficient Design
Unlike the heavier engines of its time, the 273 featured a lightweight design that improved both performance and handling. The aluminum intake manifold and thinner block walls helped reduce weight without compromising durability.
Smooth Power Delivery
Thanks to its short stroke and efficient combustion design, the 273 Dodge engine delivered smooth acceleration and consistent torque across the RPM range. Drivers loved its responsiveness and low-end power, especially in vehicles like the Dodge Dart and Plymouth Barracuda.
Easy to Maintain
The 273 was engineered with simplicity in mind. Routine maintenance such as oil changes, valve adjustments, and gasket replacements were easy to perform. This made it a favorite for both mechanics and DIY enthusiasts.
Popular Vehicles That Used the 273 Dodge Engine
The 273 powered several iconic vehicles in the 1960s, helping Dodge and Plymouth gain traction in the performance market. Some of the most popular models include:
- Dodge Dart GT (1964–1967)
- Plymouth Barracuda (1964–1967)
- Plymouth Valiant
- Dodge Coronet
These cars combined stylish design with the reliable punch of the 273 engine, making them stand out on the streets and racetracks.
The 273 Commando: Performance Upgrade
The 273 Commando variant was the high-performance version of the engine, designed for enthusiasts seeking more horsepower. It featured:
- A 10.5:1 compression ratio
- A 4-barrel carburetor
- Dual exhausts
- Chrome valve covers
- Special camshaft for higher RPM performance
This setup allowed the Commando to produce 235 horsepower — impressive for its size. It became the stepping stone for the later 318, 340, and 360 engines that defined Dodge’s muscle car era.
Comparing the 273 to Other Dodge Engines
When comparing the 273 Dodge engine to later small-blocks like the 318 or 340, the 273 stands out for its balance and originality.
- Versus 318: The 273 was lighter and revved faster, though the 318 offered more torque.
- Versus 340: The 340 had more raw power, but the 273’s fuel economy and smoothness made it more practical for daily driving.
For restoration projects or vintage builds, the 273 offers a unique charm that larger engines often lack.
Modern Uses of the 273 Dodge Engine
Even in modern times, the 273 Dodge engine holds value for classic car restorers and hot rod builders. With proper maintenance and minor upgrades, it remains a dependable and enjoyable motor.
Enthusiasts often rebuild these engines using modern performance parts — upgrading ignition systems, carburetors, or exhausts — while maintaining the original character. This combination of old-school power and modern reliability keeps the 273 relevant today.
How to Identify a 273 Dodge Engine
If you’re buying or restoring a vintage Dodge, it’s useful to know how to identify the engine.
- Look for the casting number “2465315” on the block.
- Check for a single rocker arm shaft on each head.
- Verify the 3.625-inch bore measurement.
- The engine serial number can confirm if it’s a standard or Commando variant.
Accurate identification ensures you get authentic parts and maintain originality in your restoration project.
Common Problems and Maintenance Tips
Even a reliable engine like the 273 Dodge can experience wear over time. Here are some typical issues and maintenance suggestions:
Common Issues
- Oil leaks from valve covers or oil pan
- Worn camshaft lobes due to poor lubrication
- Carburetor tuning problems causing rough idling
- Cooling issues from old radiators or water pumps
Maintenance Tips
- Change oil every 3,000 miles or annually
- Use high-quality gaskets and seals
- Keep the carburetor clean and adjusted
- Regularly inspect belts, hoses, and spark plugs
Proper care can extend the life of your 273 engine for decades.
Performance Upgrades for the 273 Dodge Engine
If you want to boost your engine’s performance while maintaining its original integrity, consider these upgrades:
- Electronic ignition system for better spark control
- High-flow carburetor to improve air-fuel mix
- Upgraded camshaft for higher RPM range
- Dual exhaust system for improved flow and sound
These modifications can transform your 273 into a spirited performer without sacrificing reliability.
Frequently Asked Questions (FAQ)
What vehicles used the 273 Dodge engine?
The 273 engine appeared in models like the Dodge Dart, Plymouth Barracuda, Valiant, and Coronet during the mid-1960s.
How much horsepower does the 273 Dodge engine have?
The standard version produced 180 horsepower, while the high-performance Commando version generated 235 horsepower.
Is the 273 engine reliable?
Yes, the 273 is known for its durability and low maintenance needs. With proper care, it can last for hundreds of thousands of miles.
Can you still find parts for the 273 Dodge engine?
Many aftermarket suppliers still offer parts for the 273, including pistons, gaskets, and performance upgrades, making restoration easy.
How does the 273 compare to the 318?
The 273 is lighter and more responsive, while the 318 provides more torque and slightly better overall power for heavier vehicles.
Why the 273 Dodge Engine Still Matters
The 273 Dodge engine is more than just a piece of automotive history — it’s a symbol of American engineering excellence. Compact, powerful, and dependable, it set the foundation for many of Dodge’s later successes in the muscle car world.
Whether you’re restoring a classic Dart, upgrading a Barracuda, or simply appreciating a well-built engine, the 273 remains a timeless choice. Its balance of power, efficiency, and simplicity makes it perfect for enthusiasts who value both performance and heritage.
If you’re planning a restoration or looking for an engine that blends history with power, consider the 273 Dodge engine — a classic V8 that continues to impress drivers and collectors worldwide.
