What Size Bolts for Engine Stand?

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When attaching an engine to an engine stand, the size and type of bolts used are essential for ensuring safety and stability.

This article will help you determine the what size bolts for engine stand are needed for an engine stand. The example will use a 440 engine stand, but does apply with other types.

What size bolts for engine stand - Deisel Engine on a stand

Size and Type of Bolts

Based on information gathered from experienced mechanics, the recommended size of bolts for a 440 engine stand is as follows:

  • 3/8″-16, grade 5 bolts: This size is commonly used, and many mechanics have successfully used these bolts for their engine stands.
  • 5/16″ bolts, grade 5: Some mechanics have also found success with this size, provided they have approximately 1″ of engagement into the bell face.

In general, low-grade bolts are satisfactory as long as they go in at least 3/4 inch into the block. However, some people might argue that titanium bolts or at least grade 8 with lock washers and safety wire are necessary.

For small blocks, such as a 360 Magnum, the same size bolts can be used, although it is always best to verify before proceeding.

When Mounting an Engine to an Engine Stand What Grade of Bolt Should Be Used?

Choosing the correct grade of bolt when mounting an engine to an engine stand is crucial for ensuring the engine’s stability and safety during the rebuilding process. This section will discuss the various bolt grades and their suitability for mounting an engine to an engine stand.

  • Grade 5 Bolts: Grade 5 bolts are the most commonly recommended bolt grade for mounting an engine to an engine stand. With a tensile strength of around 120,000 psi, these bolts provide an adequate balance of strength and affordability. When using grade 5 bolts, ensure that they are threaded at least 3/4 inch into the block for optimal security.
  • Grade 8 Bolts: Some mechanics argue that grade 8 bolts, with a tensile strength of approximately 150,000 psi, are a better choice for mounting an engine to an engine stand. While these bolts offer higher strength, they can be more expensive and are not always necessary for typical engine stand applications. However, if you prefer added security, grade 8 bolts can be a suitable choice.
  • Other Grades and Materials: While grade 5 and grade 8 bolts are the most common choices for engine stand applications, other options include titanium bolts or class 10.9 metric bolts. Titanium bolts offer excellent strength-to-weight ratios, but they can be costly and are not typically required for engine stand use. Class 10.9 metric bolts are roughly equivalent to U.S. grade 8 bolts in terms of strength, and they can be used if you are working with European engine blocks.

Safety Considerations

When attaching your engine to the engine stand, it’s essential to exercise caution and prioritize safety. Lifting an engine onto the stand can be challenging without a hoist, and it’s highly recommended to seek assistance from friends or use a hoist.

A cherry picker or engine crane can make the task much more manageable and safer, reducing the risk of injury.


In conclusion, the most commonly recommended bolt sizes for a 440 engine stand are 3/8″-16 and 5/16″ grade 5 bolts. It is essential to verify the correct size and type of bolts for your specific engine and stand before proceeding. Additionally, always prioritize safety and consider using a hoist or cherry picker to ensure the engine is securely attached to the stand.

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