When it comes to small block engines, the 350 and 400 are two of the most popular options.
While they share a similar block design, there are some key differences between the two that are worth exploring.
In this article, we’ll take a closer look at the 400 Small Block Vs 350 and compare their specifications, performance, and applications.
Whether you’re a car enthusiast or just curious about the differences between these two engines, this article will provide you with all the necessary information to make an informed decision.
So, buckle up and let’s dive into the world of small block engines!
What’s the difference between a 400 small block and a 350?
The comparison between a 400 Small Block and a 350 engine involves examining various aspects such as displacement, performance, design, and applications. Both engines belong to the small block family, but they differ in several key areas that significantly impact their performance and suitability for specific applications.
1. Displacement
The primary distinction between the 400 Small Block and the 350 engine lies in their displacement. The numbers “400” and “350” refer to the cubic inch (ci) displacement of each engine. The 400 Small Block has a larger displacement, measuring 400 cubic inches, compared to the 350 engine, which has a displacement of 350 cubic inches. This difference in size has implications for power output, torque, and overall performance.
2. Bore and Stroke
The bore and stroke dimensions contribute to the engine’s displacement and affect its characteristics. The 400 Small Block typically has a larger bore and stroke than the 350 engine. A larger bore allows for more air to enter the combustion chamber, while a longer stroke increases the distance the piston travels, affecting torque production. These dimensions influence the engine’s overall design and performance characteristics.
3. Performance and Power Output
Due to its larger displacement, the 400 Small Block generally produces more power and torque compared to the 350 engine. The additional cubic inches result in increased air and fuel intake, leading to higher combustion efficiency and greater power generation. This makes the 400 Small Block a preferable choice for applications where high performance and power are essential, such as in racing or high-performance street vehicles.
4. Compression Ratio
The compression ratio is a crucial factor in determining an engine’s efficiency and power output. The 400 Small Block may have a different compression ratio compared to the 350 engine. The compression ratio influences the engine’s ability to burn fuel efficiently and affects its overall performance characteristics, including horsepower and torque.
5. Design and Components
While both engines belong to the small block family of V8 engines produced by various manufacturers, there may be differences in design and components. The 400 Small Block may incorporate specific features or components that optimize its performance and durability, considering its larger displacement. Understanding the nuances of each engine’s design is crucial for enthusiasts and professionals seeking to maximize performance.
6. Weight and Size
The physical dimensions and weight of the engines can impact the overall dynamics of a vehicle. The 400 Small Block, being larger in displacement, may be heavier than the 350 engine. This can affect the vehicle’s balance and handling, particularly in applications where weight distribution is a critical factor, such as in racing or high-performance driving.
7. Fuel Efficiency
The larger displacement of the 400 Small Block may result in different fuel efficiency compared to the 350 engine. Factors such as combustion efficiency, fuel injection systems, and tuning can influence the engines’ miles per gallon (MPG) performance. Understanding the fuel efficiency of each engine is essential for those who prioritize economical driving or have specific requirements related to fuel consumption.
8. Applications
The choice between a 400 Small Block and a 350 engine often depends on the intended application. The 400 Small Block, with its higher power output, is well-suited for performance-oriented applications, including racing, hot rodding, and other high-performance vehicles. The 350 engine, while still capable of impressive performance, may be preferred for applications where a balance of power and fuel efficiency is crucial, such as in daily drivers or more conservative performance setups.
How much HP does a 400 small block have?
The Small Block Chevy 400 has an engine displacement of 400 cubic inches and is capable of producing up to 265 horsepower when kept in stock condition. However, it’s worth noting that the actual horsepower generated by the engine can vary depending on various factors such as the engine’s age, modifications, and tuning.
What’s the difference between a 350 and a 400 Chevy transmission?
The comparison between a 350 and a 400 Chevy transmission involves examining their design, specifications, applications, and performance characteristics. Both transmissions belong to the Turbo-Hydramatic (TH) family, but they differ in several key aspects that impact their performance and suitability for various vehicles and applications.
1. Naming and Origin
The 350 and 400 transmissions are part of the Turbo-Hydramatic series, but their numerical designations refer to their respective torque capacity. The TH350 (Turbo-Hydramatic 350) has a lower torque capacity compared to the TH400 (Turbo-Hydramatic 400). These transmissions were developed by General Motors and have been widely used in various GM vehicles.
2. Torque Capacity
One of the most significant differences between the TH350 and TH400 is their torque capacity. The TH400 is known for its higher torque-handling capabilities. This makes the TH400 more suitable for applications where a higher torque load is expected, such as in high-performance and heavy-duty vehicles. The TH350, while robust, is generally considered more suitable for moderate to light-duty applications.
3. Size and Weight
Due to the differences in internal components and torque capacity, the TH400 is typically larger and heavier than the TH350. The increased size and weight contribute to the TH400’s ability to handle higher torque loads but may also impact the overall weight and balance of a vehicle.
4. Gearing Ratios
The gearing ratios of the TH350 and TH400 are another point of differentiation. While both transmissions provide three forward gears, the specific ratios may vary. The TH350 often has a milder first gear ratio compared to the TH400, which can impact acceleration and overall performance. The gearing ratios play a crucial role in how the vehicle responds to different driving conditions.
5. Applications
The choice between a TH350 and TH400 often depends on the intended application of the vehicle. The TH350 is commonly found in a wide range of GM vehicles, including passenger cars, light trucks, and some performance-oriented applications. On the other hand, the TH400 is often chosen for heavier vehicles, high-performance applications, and trucks where the ability to handle greater torque is essential.
6. Fuel Efficiency
The differences in gearing ratios and torque capacity can also influence fuel efficiency. Generally, a transmission with higher torque capacity may result in slightly lower fuel efficiency due to the added weight and the energy required to move larger internal components. However, the impact on fuel efficiency can vary based on the overall vehicle setup and driving conditions.
7. Performance and Racing
Enthusiasts and racers often choose the TH400 for high-performance and racing applications where durability and torque handling are critical. The TH400 is known for its strength and ability to withstand the stresses of high-performance driving, making it a popular choice in drag racing and other demanding motorsports.
8. Cost and Availability
The cost of the transmission and the availability of replacement parts can also be factors in the decision-making process. In some cases, the TH350 may be more cost-effective and easier to find replacement parts for, making it a practical choice for budget-conscious projects.
What makes a small block 400?
A small block 400 refers to a specific type of engine produced by Chevrolet, commonly known as the 400 Small Block. This engine is part of the Chevrolet Small-Block engine family, which has been a staple in the automotive industry for decades. Here are the key characteristics and features that make a small block 400 distinct:
1. Displacement
The “400” in the small block 400’s name refers to its cubic inch displacement. It has a displacement of 400 cubic inches, making it one of the larger options within the small block engine family. The larger displacement contributes to increased power and torque potential.
2. Bore and Stroke
The engine’s bore and stroke dimensions determine its displacement and overall characteristics. The small block 400 typically features a larger bore and stroke compared to other small block engines. These dimensions influence the engine’s breathing capabilities and contribute to its performance.
3. Architecture
The small block 400 shares the same basic architecture as other engines in the Chevrolet Small-Block family. This includes features like a 90-degree V8 configuration, overhead valves (OHV), and a cam-in-block design. This architecture has proven to be versatile, reliable, and widely used in various applications.
4. Cylinder Heads
The small block 400 often comes equipped with specific cylinder heads optimized for its larger displacement. These cylinder heads contribute to efficient airflow and combustion, enhancing the engine’s overall performance.
5. Performance Potential
Due to its larger displacement, the small block 400 has a higher performance potential compared to smaller small block engines. It is capable of producing more power and torque, making it well-suited for applications where high performance is a priority, such as in muscle cars, hot rods, and other performance-oriented vehicles.
6. Block Material and Strength
The engine block of the small block 400 is typically made from cast iron. The material used in the block provides durability and strength, allowing the engine to handle higher levels of power and stress. This is particularly important in high-performance and heavy-duty applications.
7. Crankshaft and Rotating Assembly
The small block 400 features a robust crankshaft and rotating assembly designed to handle the increased forces generated by its larger displacement. The durability of these components contributes to the engine’s overall reliability and longevity.
8. Versatility
While the small block 400 is often associated with high-performance applications, it remains a versatile engine that can be adapted for various uses. It has been used in a range of vehicles, from sports cars to trucks, thanks to its blend of power and flexibility.
9. Aftermarket Support
The popularity of the small block 400 has led to a robust aftermarket support system. Enthusiasts and builders can find a wide array of performance parts, upgrades, and accessories designed specifically for the small block 400, allowing for customization and fine-tuning based on individual preferences and requirements.
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Can you put a 350 crank in a 400 block?
Yes, it is possible to install a 350 crankshaft in a 400 block. However, it requires some modifications to the block and the crankshaft. You’ll need to use either main bearing spacers or a custom crankshaft to make the 350’s 2.45-inch main journals fit the 400’s 2.65-inch main journals. The resulting engine will have a displacement of 377 cubic inches.
According to a post on the Hot Rod Forum, a 350 crankshaft in a 400 block makes for a good high-winding engine that can produce a lot of horsepower. However, you will need to use custom pistons to make the 350’s 5.7-inch rods fit the 400 block.
Can you put 350 heads on a 400?
Yes, it is possible to use 350 heads on a 400 engine block. The only difference between 350 and 400 heads is the steam holes in the 400 heads. To use 350 heads on a 400 block, you can simply place a 400 head gasket on it, keep the gasket in place with some head bolts, and drill 6 steam holes.
According to a post on the Hot Rod Forum, if you install 350 heads on a 400 block without drilling steam holes, it will run hot due to hot spots that develop due to the siamesed cylinders in a 400 block.
Is a 400 small block a V8?
Yes, a 400 small block is a V8 engine produced by Chevrolet between 1970 and 1980. It was the largest displacement engine made in the small-block family, with a displacement of 400 cubic inches. The engine was intended as a low-performance, high-torque engine primarily used in Chevy’s heavier passenger cars and light-duty trucks.
400 small block vs 350 sound
The sound of an engine is determined by many factors, including the exhaust system, camshaft, and compression ratio. However, in general, a 400 small block engine will have a deeper and more aggressive exhaust note than a 350 engine due to its larger displacement and longer stroke.
The 400 small block engine was designed to generate strong torque at low RPM, making it ideal for pickup trucks and SUVs. The 350 small block engine, on the other hand, is known for its dependability and longevity, and is used in a wide range of applications, including boats.
How Much is a 400 Small Block Worth?
The value of a 400 small block engine can vary depending on its condition, size, make, model, and year. According to Wheels Adviser, a 400 small block engine is worth anywhere from around $500 to $1,500. However, the price can be higher for a new engine and lower for a used engine.
Is a Chevy 400 Small Block a Good Engine?
According to Wheels Adviser, the Chevy 400 Small Block is a great engine choice for those who want a reliable and powerful engine. It has a classic design, modern features, and can be used in a variety of applications. It is also affordable and easy to maintain.
The Small Block Chevy 400 has an engine displacement of 400 cubic inches, capable of up to 265 horsepower when kept in stock condition. The engine was intended as a low-performance, high-torque engine primarily used in Chevy’s heavier passenger cars and light-duty trucks.
The Small Block Chevy 400 is almost 50 years old, but it still has a lot of potential. According to a post on Road Sumo, the 400 Small Block Chevy engine is still worth installing in your car. The engine is capable of producing strong torque at low RPM, making it ideal for pickup trucks and SUVs.
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350 crank in 400 block bearings
If you are asking about the bearings required for installing a 350 crankshaft in a 400 block, then you will need to use either main bearing spacers or a custom crankshaft to make the 350’s. 45-inch main journals fit the 400’s 2.65-inch main journals.
A 350 crankshaft in a 400 block makes for a good high-winding engine that can produce a lot of horsepower. However, you will need to use custom pistons to make the 350’s 5.7-inch rods fit the 400 block.
Chevy 400 Small Block Liters
The Chevy 400 Small Block engine has a displacement of 6.6 liters. It was the largest version of the Generation I small-block and was produced by Chevrolet between 1970 and 1980. The engine was intended as a low-performance, high-torque engine primarily used in Chevy’s heavier passenger cars and light-duty trucks.
FAQs
What is the horsepower of a 400 Small Block engine?
The Small Block Chevy 400 has an engine displacement of 400 cubic inches and is capable of producing up to 265 horsepower when kept in stock condition.
What is the horsepower of a 350 engine?
The Small Block Chevy 350 has an engine displacement of 350 cubic inches and is capable of producing up to 330 horsepower when kept in stock condition.
What is the torque of a 400 Small Block engine?
The Small Block Chevy 400 is capable of producing up to 400 lb-ft of torque when kept in stock condition.
What is the torque of a 350 engine?
The Small Block Chevy 350 is capable of producing up to 350 lb-ft of torque when kept in stock condition.
What is the fuel efficiency of a 400 Small Block engine?
The fuel efficiency of a Small Block Chevy 400 engine can vary depending on various factors such as the engine’s age, modifications, and tuning. However, it’s worth noting that the 400 Small Block is not known for its fuel efficiency.
What is the fuel efficiency of a 350 engine?
The fuel efficiency of a Small Block Chevy 350 engine can vary depending on various factors such as the engine’s age, modifications, and tuning. However, it’s worth noting that the 350 Small Block is not known for its fuel efficiency.
What is the compression ratio of a 400 Small Block engine?
The compression ratio of a Small Block Chevy 400 engine can vary depending on various factors such as the engine’s age, modifications, and tuning. However, the stock compression ratio of a 400 Small Block is typically around 8.5:1.
What is the compression ratio of a 350 engine?
The compression ratio of a Small Block Chevy 350 engine can vary depending on various factors such as the engine’s age, modifications, and tuning. However, the stock compression ratio of a 350 Small Block is typically around 8.5:1.
What are the applications of a 400 Small Block engine?
The Small Block Chevy 400 is a versatile engine that can be used in a variety of applications such as street rods, muscle cars, and trucks. Due to its high torque output, it’s particularly well-suited for heavy-duty applications such as towing and hauling.
Conclusion
The 400 Small Block and 350 engines are both excellent options for car enthusiasts and mechanics alike.
While they share a similar block design, the 400 Small Block has a larger bore and stroke, which results in a higher displacement and more power.
The 350, on the other hand, is known for its high horsepower output and reliability.
Ultimately, the choice between these two engines comes down to your specific needs and preferences.
Whether you’re looking for a high-torque engine for heavy-duty applications or a high-horsepower engine for racing, both the 400 Small Block and 350 engines have something to offer.
We hope this article has provided you with all the necessary information to make an informed decision.
