Chevy 400 Small Block – A Comprehensive Guide

The Chevy 400 Small Block engine is an iconic engine that has been around since the late 1960s. It has a reputation for being one of the most powerful engines in its class, and it has been used in a variety of applications, from street racing to drag racing to dirt track racing.

In this article, we’ll take a look at the Chevy 400 Small Block engine in more detail, and we’ll provide you with all the information you need to know about this powerful engine.

Overview of the Chevy 400 Small Block

The Chevy 400 Small Block engine was introduced in 1970, and it was part of the second generation of small block engines from General Motors. It was designed to provide more power than the previous generation of small block engines, and it did so by increasing the bore and stroke of the engine.

The engine had a bore of 4.125 inches and a stroke of 3.75 inches, which gave it a total displacement of 400 cubic inches. It was available as a block with 2 or 4-bolt main caps and was equipped with forged crankshafts, pistons, and connecting rods.

The engine was available with a variety of different cylinder heads, including both iron and aluminum heads. It also had a high-lift hydraulic camshaft, which helped it to produce more power than other small block engines at the time.

Applications of the Chevy 400 Small Block

The Chevy 400 Small Block engine was used in a variety of different applications, including street racing, drag racing, and dirt track racing. It was also used in the Chevrolet Impala, as well as in Chevy trucks and vans.

The engine was well-known for its power and reliability, and it was widely regarded as one of the best small block engines ever produced by General Motors.

Modifications and Upgrades for the Chevy 400 Small Block

If you’re looking to modify or upgrade your Chevy 400 Small Block engine, there are a variety of options available to you.

One popular upgrade is to install a new camshaft, which can increase the power and torque output of the engine. Performance intake and exhaust systems can also be installed to increase the engine’s efficiency.

You can also upgrade the cylinder heads, which can help to increase the engine’s horsepower and make it more durable. Upgrades can also include changing the carburetor, the ignition system, and even the gearing in the transmission.


If you’re looking for a powerful and reliable engine for your vehicle, you can’t go wrong with the Chevy 400 Small Block. It’s still one of the most popular small block engines on the market today and has a reputation for being one of the best.

With its high-lift hydraulic camshaft and forged crankshaft, this engine is known for its durability and power. And with a variety of modifications and upgrades available, you can customize it to suit your specific needs and preferences.

So whether you’re building a street machine, a drag racer, or a dirt track racer, the Chevy 400 Small Block is an excellent choice when it comes to high-performance engines.

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