Rajan Wilcox
The Chevrolet 350 small-block engine is a popular choice for car enthusiasts and has been used in various GM vehicles over the years. The 350 has been produced in both carbureted and fuel-injected forms, with the fuel-injected version offering improved performance and efficiency. Upgrading to an electronic fuel injection (EFI) system can cost upwards of $2,000, but it delivers significant torque at lower RPMs. The 350's power can be further enhanced with modifications like cam upgrades, exhaust improvements, and valve spring replacements. With the right combination of parts and tuning, it is possible to achieve over 300 horsepower in a fuel-injected 350 engine.
| Characteristics | Values |
|---|---|
| Engine type | Chevrolet small-block V8 |
| Engine capacity | 350 cu in (5.7 L) |
| Fuel injection type | Throttle-body injection ("spider"), port injection, electronic fuel injection (EFI), Rochester fuel injection |
| Power | 160-205 hp (depending on model year and engine specifications) |
| Torque | 250-290 lb⋅ft |
| RPM | 3,800-4,000 |
| Fuel injector cleaner | Seafoam or fuel injector cleaner |
| Fuel injector cost | $200 for a new spider |
| Fuel efficiency | May vary depending on the fuel injection system; EFI systems may be less fuel-efficient than carbureted engines |
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What You'll Learn
Fuel injection kits
There are several fuel injection kits available for 350 engines, including the Edelbrock ProFlo4, which offers true multi-port injection and has been praised for its stability, fuel consumption, and ease of adjustment. The Edelbrock ProFlo4 costs more than the more popular Holley and FiTech units but offers more features. Another option is the Holley Sniper EFI system, which is designed to be easy to set up and comes with a 3.5-inch display that shows engine information. The Holley Sniper EFI starts at just $999 and offers complete control of the engine, self-learning fuel strategies, and race-winning technology.
For those seeking even more power, the FiTech 600hp system is an option that provides external fuel pumps and return lines, eliminating the need to drop the fuel tank. Additionally, the Holley Terminator X and Terminator X Max are powertrain management systems that offer plug-and-play control for most domestic V8 engines. These systems include features such as real-time fuel learning, high-impedance injector drivers, and integrated MAP sensors.
When considering a fuel injection kit, it is important to keep in mind that they may not offer the same long-term reliability as a new car with extensive R&D and testing. However, with careful installation and attention to wiring, fuel, and charging systems, many potential problems can be avoided.
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Engine power
The engine power of a fuel-injected 350 depends on a variety of factors, including the specific engine, the fuel injection system, and any modifications made. Let's take a closer look at the different aspects that contribute to the engine power of a fuel-injected 350.
Engine Variations
The Chevrolet 350 small-block engine has been utilized across different vehicle models and generations, each offering unique performance characteristics. For instance, the 1982 L83 Corvette engine produced 200 hp, while the 1984 version of the same engine generated 205 hp. The 1985 L98 350 engine introduced tuned-port fuel injection, delivering enhanced power.
Fuel Injection Systems
The type of fuel injection system plays a crucial role in engine power. The Rochester Quadrajets, commonly found in LT9 engines, are known for their performance. Meanwhile, the Edelbrock 2-barrel fuel injection system is designed to produce significant torque at lower RPMs, offering a distinct power characteristic. The "spider" fuel injection setup, used in some Chevy models, features a common fuel feed with solenoids controlling fuel flow to each port injector.
Modifications and Upgrades
Modifications and upgrades can significantly impact the engine power of a fuel-injected 350. For example, installing a bigger camshaft can increase power output, as seen in the 1955 Chevrolet 265 cu in (4.3 L) V8 engine, which produced 1 hp per 1 cu in with fuel injection and a Duntov high-lift camshaft. Upgrading to an EFI (Electronic Fuel Injection) system can also enhance power but comes at a higher cost compared to carbureted engines. Additionally, modifications to the valve springs, valve guides, and exhaust system can further increase engine power.
In summary, the engine power of a fuel-injected 350 can vary based on the specific engine, the fuel injection system employed, and any modifications or upgrades made. By understanding these factors, one can tailor the 350 engine to suit their desired performance needs.
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Cost
The cost of fuel injection depends on several factors, including the type of vehicle, the specific fuel injection system, and whether the installation is performed by a professional or done as a DIY project.
For a Ford F-350 Super Duty vehicle, the average cost for a fuel injector replacement ranges from $1,202 to $1,472. This price can vary depending on the specific car model.
If you're considering an aftermarket fuel injection system for a 350 Chevy engine, the cost can be significantly higher. An EFI (Electronic Fuel Injection) system can add an extra $2,000 to $4,000 to the price of the engine. This cost reflects the additional components and complexity of an EFI system compared to a carbureted engine.
When it comes to installation costs, the price can vary widely. Some users have reported costs of around $1,500 for a fuel-injected 350 installation, while others have mentioned prices as high as $15,000 for a Vortec install with a new crate motor. The cost can depend on the quality of the installation, with reliable and smog-legal swaps typically commanding a higher price.
It's worth noting that a DIY installation can significantly reduce costs, but it requires a certain level of expertise and consideration of additional expenses for parts, motor, and other peripheral components. For example, adapting to the stock transmission or transfer case, or adding power steering and power brakes, can increase the overall cost.
In summary, the cost of fuel injection for a 350 engine can vary from a few thousand dollars to over $10,000, depending on the specific engine, fuel injection system, installation method, and additional components or modifications required.
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Carburetors
Carburetor enthusiasts appreciate their old-school cool factor and the fact that they are simple to diagnose and fix. For example, a well-tuned Quadrajet carburetor can offer good throttle response, torque, drivability, and efficiency. Carburetors are also generally more cost-effective than fuel injection systems, which can add $2,000 to $4,000 to the price of an engine.
On the other hand, fuel injection systems, such as EFI (Electronic Fuel Injection), offer several advantages over carburetors. EFI provides easier starting, better fuel control, improved reliability, and enhanced performance across the engine's operating range. It also allows for adjustments on the go, without the need for tools, making it very user-friendly.
When considering an upgrade from a carburetor to fuel injection, there are two main options: throttle body injection (TBI) and multi-port fuel injection (MPFI). TBI is a simpler, more cost-effective option, serving as a direct carburetor replacement without requiring changes to the intake manifold. However, it may have distribution inefficiencies and lack some of the capabilities of MPFI. MPFI, while more complex and costly, is generally considered a better approach to EFI conversion due to its superior capabilities.
In conclusion, while carburetors have their benefits and are still favoured by many, especially in racing and classic vehicle restorations, fuel injection systems offer advancements in technology that provide improved performance, reliability, and ease of use. The decision between the two ultimately depends on factors such as the vehicle's intended use, the user's preferences, and budget.
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Performance
The performance of a fuel-injected 350 engine depends on several factors, including the specific engine configuration, modifications, and driving conditions. Here is some information on the performance of fuel-injected 350 engines, particularly focusing on the Chevrolet small-block 350 engine:
Chevrolet Small-Block 350 Engine Performance
The Chevrolet small-block 350 engine is a popular and versatile engine that has been used in various vehicles, including pickup trucks, the Corvette, and the Camaro. This engine has a displacement of 350 cubic inches (5.7 litres) and is known for its performance and durability.
The stock performance of the Chevrolet 350 engine varies depending on the year and specific model. For example, the 1984 Chevrolet C/K and G-series trucks with the LS9 engine produced 165 horsepower (hp) at 3,800 revolutions per minute (rpm) and 275 pound-feet (lb-ft) of torque at 1,600 rpm.
Fuel Injection Performance Improvements
Fuel injection, particularly electronic fuel injection (EFI), can significantly improve the performance of a 350 engine. The Edelbrock 2-barrel fuel injection system, for instance, is designed to produce more torque at lower RPMs, enhancing throttle response and low-end power.
Aftermarket fuel injection systems can be costly, typically adding $2,000 to $4,000 to the price of the engine. However, they offer performance advantages, especially when combined with other modifications.
Other performance modifications include upgrading the exhaust system with long tubes, high-flow catalytic converters, and performance mufflers. These changes improve the engine's breathing, resulting in increased horsepower.
Longevity and Reliability
The Chevrolet 350 engine is renowned for its longevity and reliability. For example, a Wisconsin businessman reported that his 1991 Chevrolet C1500 pickup truck had logged over one million miles without any major repairs to its small-block 350 engine.
In conclusion, a fuel-injected 350 engine, particularly the Chevrolet small-block 350, offers excellent performance potential. With stock configurations, modified fuel injection systems, and performance upgrades, these engines can deliver increased horsepower, torque, and overall driving performance.
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Frequently asked questions
A 350 Chevy with EFI is an electronic fuel-injected 350 that features the Edelbrock 2-barrel fuel injection system.
An EFI system can cost anywhere from USD 2,000 to USD 4,000, depending on the system and its specifications.
A carbureted engine uses a carburetor to mix air and fuel, while an EFI system uses electronic fuel injection to deliver fuel directly to the engine's cylinders.
Some common issues with the Chevy 350 fuel injection system include misfire codes, rough idle, and hard starting. These issues can often be resolved by cleaning the system with a fuel injector cleaner or seafoam.
Throttle body injection involves a single fuel injector located in the throttle body, while port injection delivers fuel directly to the intake ports of each cylinder. Port injection is generally considered more efficient and provides better performance.
