Chevy 400 Small Block Engine: Specs, Configuration, and Service Intervals

Chevy 400 Small Block Engine Specs

The Chevy 400 Small Block engine is a legendary powerhouse known for its performance and durability. This V8 engine was produced by General Motors from 1970 to 1980 and is still highly sought after by automotive enthusiasts today. Let’s delve into the specifications of this iconic engine.

Engine Configuration

The Chevy 400 Small Block engine falls under the category of a V8 engine, meaning it has eight cylinders arranged in a V-shaped configuration. It features a 90-degree angle between the cylinder banks, providing a balanced and smooth operation. The engine has a displacement of 6.6 liters or 400 cubic inches, hence its name.

One notable feature of the Chevy 400 Small Block is its large bore size of 4.125 inches, which allows for increased airflow and improved power output. The engine also has a stroke length of 3.75 inches, contributing to its torquey nature.

Engine Oil Specs & Service Intervals

Proper engine oil specifications and regular service intervals are crucial for maintaining the longevity and performance of any engine, including the Chevy 400 Small Block. Here are some important details to consider:

Engine Oil Specifications:

When it comes to selecting the right engine oil for your Chevy 400 Small Block, it is essential to use an oil that meets the manufacturer’s recommendations. The engine requires a high-quality, multi-viscosity oil with a viscosity rating of 10W-30 or 10W-40. This ensures proper lubrication and protection for the engine components, especially during cold starts.

Additionally, it is advisable to choose an engine oil that contains additives to prevent wear, reduce friction, and maintain cleanliness. Look for oils that meet the API (American Petroleum Institute) standards, such as API SN or API SP.

Service Intervals:

Regular maintenance is key to keeping your Chevy 400 Small Block engine running smoothly. Here are some recommended service intervals to follow:

1. Oil Change: It is generally recommended to change the engine oil and oil filter every 3,000 to 5,000 miles or every three to six months, whichever comes first. However, it is always best to consult your vehicle’s owner’s manual for the manufacturer’s specific recommendations.

2. Oil Filter Replacement: Along with the oil change, it is crucial to replace the oil filter. A clogged or dirty oil filter can restrict oil flow, leading to poor engine performance and potential damage.

3. Check Fluid Levels: Regularly check other fluid levels, such as coolant, transmission fluid, and power steering fluid. Topping up or replacing fluids as needed ensures optimal engine performance and prevents overheating or component failure.

4. Spark Plug Replacement: Spark plugs play a vital role in the combustion process. It is recommended to replace them every 30,000 to 50,000 miles, depending on driving conditions and the type of spark plugs used.

5. Air Filter Replacement: A clean air filter allows for proper airflow to the engine, promoting efficient combustion. Replace the air filter every 12,000 to 15,000 miles or as recommended by the manufacturer.

By following these service intervals and using the appropriate engine oil, you can ensure that your Chevy 400 Small Block engine remains in top-notch condition for years to come.

Detailed Engine Specifications

To provide a comprehensive overview of the Chevy 400 Small Block engine, here are the detailed specifications in a convenient table format:

Please note that these specifications may vary depending on the specific model, year, and any modifications made to the engine.

In conclusion, the Chevy 400 Small Block engine is a true powerhouse with its impressive specifications and performance capabilities. By adhering to the recommended engine oil specifications and service intervals, you can ensure that this iconic engine continues to deliver the power and reliability it is known for.