Differences between 153 and 168 Tooth Flywheel

The flywheel is an important component of an engine’s rotating assembly, and it plays a vital role in the engine’s overall performance. Flywheels come in different sizes and tooth counts, and two common options are 153-tooth and 168-tooth flywheels. In this response, we will discuss the differences between these two flywheels, including their specifications, advantages, and disadvantages.


Here are the specifications for 153-tooth and 168-tooth flywheels:

Specification 153-Tooth Flywheel 168-Tooth Flywheel
Diameter 12.75 inches 14 inches
Tooth Count 153 168
Weight 25-30 pounds 30-35 pounds
Compatibility Small Block Chevy Big Block Chevy


Tooth Count:

The most significant difference between the 153-tooth and 168-tooth flywheel is the tooth count. As the name suggests, the 153-tooth flywheel has 153 teeth, while the 168-tooth flywheel has 168 teeth. This difference in tooth count affects the starter motor’s location and the flywheel’s compatibility with different engine sizes.


The 153-tooth flywheel is compatible with small block Chevy engines, while the 168-tooth flywheel is compatible with big block Chevy engines. Therefore, the two flywheels are not interchangeable, and you must use the correct flywheel for your engine.

Diameter and Weight:

The 168-tooth flywheel is larger in diameter than the 153-tooth flywheel, measuring 14 inches compared to 12.75 inches. Additionally, the 168-tooth flywheel is heavier than the 153-tooth flywheel, weighing between 30-35 pounds compared to 25-30 pounds. The increased diameter and weight of the 168-tooth flywheel result in increased rotational inertia, which can provide some advantages.

Advantages and Disadvantages:

The 153-tooth flywheel is lighter and has a smaller diameter than the 168-tooth flywheel, which means it can rev up faster and provide quicker acceleration. However, the smaller diameter also means that it has less rotational inertia, which can make the engine less stable at low RPMs.

In contrast, the 168-tooth flywheel’s larger diameter and heavier weight provide increased rotational inertia, which can make the engine more stable at low RPMs. However, the increased weight and diameter can also cause slower acceleration and increased stress on the starter motor.


In summary, the 153-tooth and 168-tooth flywheels have different specifications and are designed for different engines. The choice between the two flywheels depends on the engine size and the desired performance characteristics. Ultimately, it is important to choose the correct flywheel for your engine to ensure optimal performance and reliability.

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