Unlocking the Secrets: My Expert Insights on LS Bellhousing Bolt Sizes You Need to Know

As a car enthusiast and a DIY mechanic, I’ve often found myself knee-deep in projects that require a keen understanding of the intricate details that keep our beloved vehicles running smoothly. One topic that frequently comes up in discussions about transmission swaps and engine rebuilds is the Ls bellhousing bolt size. Understanding the correct specifications for these bolts is not just a matter of convenience; it’s essential for ensuring a secure and reliable connection between the engine and transmission. Whether you’re a seasoned pro or just diving into the world of automotive repair, knowing the right bolt size can save you time, frustration, and possibly even money. In this article, I’ll share insights into the importance of bolt specifications, the implications of using the wrong size, and tips on how to get it right the first time. Join me as we delve into the fascinating details that make automotive projects not only possible but enjoyable!

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1. Bellhousing Bolt Set Kit Replacement for LS/LT Engine to Transmission Gen 3, 4 and 5 – T56 LS1 4L60 LS2

As someone who is passionate about automotive performance and reliability, I cannot stress enough how crucial it is to have the right components when working on an engine or transmission swap. The ‘Bellhousing Bolt Set Kit Replacement for LS/LT Engine to Transmission Gen 3, 4 and 5 – T56 LS1 4L60 LS2’ is a product that I find highly valuable for anyone looking to ensure a secure and effective connection between their LS/LT engine and transmission. This product is designed specifically for use on all GM automatic and manual transmissions that pair with LS and LT engines, including popular variants like the LSX, LS1, LS2, LS6, LS7, and LQ4. That versatility makes it an excellent choice for a wide range of builds.

What stands out to me about this kit is its attention to quality and practicality. Included in the kit are 8 zinc plated, 10.9 grade hardened steel bolts, each measuring 1.75″ in length. These specifications are critical because the grade of the bolts indicates their strength and durability, ensuring that they can withstand the stresses and vibrations associated with high-performance engines. The zinc plating adds an extra layer of protection against corrosion, which is particularly important in automotive applications where exposure to various environmental factors is inevitable. As someone who has worked on multiple engine builds, I can say that investing in high-quality fasteners like these can save a lot of headaches down the road.

Another fantastic feature of this bolt set is that no washers are needed with these flanged headed bolts. This is a small but significant convenience for builders, as it simplifies the installation process. It eliminates the need to source additional parts and reduces the likelihood of losing components during the assembly. This thoughtful design feature showcases the product’s practicality, making it easier for both seasoned mechanics and DIY enthusiasts to get the job done efficiently.

Furthermore, the compatibility with various generations of LS and LT engines means that this bolt set is not just a one-time purchase; it’s a reliable solution that can be used across multiple projects. Whether you’re working on a classic car restoration or a modern performance build, having a reliable set of bellhousing bolts at your disposal is essential. This adaptability reinforces the value of the product, as it allows for versatility in different automotive applications.

if you’re in the market for a bellhousing bolt set that combines quality, convenience, and compatibility, I highly recommend considering the ‘Bellhousing Bolt Set Kit Replacement for LS/LT Engine to Transmission Gen 3, 4 and 5 – T56 LS1 4L60 LS2’. With its robust construction and user-friendly design, this kit is sure to enhance your engine swap experience, providing peace of mind and reliability when it matters most. Don’t wait too long to make this investment—your engine deserves the best, and so do you!

Feature	Description
Compatibility	For all GM automatic and manual transmissions paired with LS/LT engines (Gen 3, 4, 5)
Included Bolts	8 zinc plated, 10.9 grade hardened steel bolts
Bolt Length	1.75 inches
Washer Requirement	No washers needed; flanged headed bolts included

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2. ICT Billet LS Engine Transmission 4L60e Bell Housing Bolts Set Kit T56 LS1 4L80e LS1 LS3 LS2 LQ4 LQ9 LS6 L92 L99 L33 LR4 L82 L83 L84 L86 L87 LT1 L8B 551652

When it comes to upgrading or maintaining your LS engine transmission setup, I find that the right components make all the difference. One standout product that has caught my attention is the ICT Billet LS Engine Transmission 4L60e Bell Housing Bolts Set Kit. This kit is specifically designed for a range of LS engine models including the LS1, LS2, LS3, LQ4, LQ9, and more. If you’re like me and value quality and performance in your automotive projects, this product could be a game-changer for you.

One of the first features that I appreciate about this bolts set is that it is made from Grade 10.9 steel. This means that these bolts are not only heavy duty but also exhibit high strength. For anyone who has ever worked with engine components, you know that durability is paramount. Using subpar bolts can lead to serious issues down the line, including stripped threads or, worse, failures that could cause significant damage to your engine. With these Grade 10.9 bolts, I feel confident that they can handle the high torque applications that LS engines are known for.

The zinc coating on these bolts is another feature that I find particularly appealing. This coating provides long-lasting corrosion protection, which is essential for any automotive application. No one wants to deal with rusted or corroded bolts, especially in a high-performance setting. The fact that these bolts prevent threads from seizing is a huge plus for me. It means that when it’s time to make adjustments or repairs, I won’t have to struggle with stubborn bolts that are stuck in place. This feature alone can save me a lot of time and frustration in the long run.

Moreover, I appreciate that these bolts do not require washers due to their flanged head design. This simplifies the installation process, making it easier for me or any DIY enthusiast to work with them. I’m always looking for ways to streamline my projects, and the fact that these bolts are JIS spec flanged head bolts means they are designed for optimal fit and function without the extra hassle of washers. It’s a small detail, but it makes a big difference in the overall ease of installation.

To summarize, the ICT Billet LS Engine Transmission 4L60e Bell Housing Bolts Set Kit offers a robust combination of high strength, corrosion protection, and user-friendly installation. For someone who is keen on maintaining or upgrading their LS engine setup, investing in these bolts is a smart move. The quality and durability they provide will undoubtedly enhance the longevity and performance of your engine. If you are looking for reliability and efficiency, I would highly recommend giving this bolts set a try.

Feature	Description
Material	Grade 10.9 steel for high strength and durability
Coating	Zinc coated for long-lasting corrosion protection
Thread Protection	Prevents threads from seizing
Design	No washers needed with flanged headed JIS spec bolts
Compatibility	Fits a range of LS engine models (LS1, LS2, LS3, etc.)

if you’re serious about your automotive projects and want to ensure that your LS engine transmission setup is both reliable and high-performing, I strongly suggest considering the ICT Billet LS Engine Transmission 4L60e Bell Housing Bolts Set Kit. With its exceptional features and benefits, this product could very well be the key to a successful build or repair. Don’t miss out on the opportunity to elevate your engine’s performance!

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3. JEGS GM LS Series Bellhousing Bolts | Grade 10.9 | Black Phosphate Finish |for Installation of Bellhousing to Engine Block | Includes 8 Bolts and 8 Washers | Made in USA

As a car enthusiast and someone who appreciates the finer details of automotive engineering, I can’t help but get excited about the JEGS GM LS Series Bellhousing Bolts. These bolts are specifically designed for GM LS series engines, and let me tell you, they really deliver on quality and performance. When it comes to installing a bellhousing to the engine block, having the right hardware is crucial, and these bolts provide that assurance. With their M10 x 1.5 thread pitch and 35mm length, they fit perfectly and ensure a secure installation.

One of the standout features of these bolts is their Grade 10.9 rating. This means that they can withstand an impressive 150,000 psi of tensile strength, offering not just durability but also peace of mind. I know from experience that when you’re working on an engine, you want components that won’t fail you under pressure. These bolts are designed to last, making them a worthwhile investment for anyone looking to enhance their engine’s reliability.

Additionally, the black phosphate finish is a thoughtful touch that I really appreciate. This coating not only provides rust resistance but also contributes to the overall longevity of the bolts. It’s essential to have components that can withstand the elements, especially if you’re operating in less-than-ideal conditions. With these bolts, I feel confident that I’m protecting my investment and ensuring that my engine remains in top condition.

Another aspect that stands out to me is that these bolts are made in the USA. Supporting domestic manufacturing is important, and knowing that these high-quality materials and assembly processes are locally sourced makes me feel good about my purchase. It speaks volumes about the commitment to quality that JEGS stands for.

In summary, if you’re in the market for reliable and high-quality bellhousing bolts for your GM LS series engine, I wholeheartedly recommend the JEGS GM LS Series Bellhousing Bolts. They are engineered to provide strength, rust resistance, and longevity—attributes that every car owner should prioritize. Investing in these bolts means investing in the performance and reliability of your engine. So why wait? Equip yourself with the best and make your engine the powerhouse it was meant to be!

Feature	Details
Compatibility	Fits all GM LS Series engines with M10 x 1.5 thread pitch x 35mm length
Grade	Grade 10.9 with 150,000 psi tensile strength
Finish	Black phosphate for rust resistance
Quantity	Includes 8 bolts and 8 washers
Origin	Made in the USA with high-quality materials

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4. ARP 134-0902 Bellhousing Bolt Kit, Black

As a car enthusiast and someone who appreciates high-performance vehicles, I can’t stress enough the importance of quality components in any build. When it comes to securing the bellhousing in a GM LS-Series engine, I recently came across the ARP 134-0902 Bellhousing Bolt Kit, and I must say, it has exceeded my expectations. This bolt kit is specifically designed for the GM LS-Series, which means it’s tailor-made for a precise fit and optimal performance. The attention to detail that ARP puts into their products is evident, and this kit is no exception.

The standout feature of the ARP 134-0902 Bellhousing Bolt Kit is its 12-point design. This is not just a cosmetic choice; the 12-point configuration allows for greater torque application without the risk of stripping the bolt head. As someone who has experienced the frustration of rounded-off bolt heads, I appreciate how this design offers an added layer of security. The black oxide finish not only looks great but also serves as a corrosion-resistant barrier, ensuring that these bolts will stand the test of time even in harsh environments.

Another important aspect to highlight is the vehicle-specific fit type. This means I can install the bolts with confidence, knowing that they are designed to work perfectly with my GM LS-Series engine. There’s nothing worse than using generic parts that might fit but don’t provide the same reliability. The ARP Bellhousing Bolt Kit guarantees a snug and secure installation, which is critical for maintaining the integrity of the engine assembly. It’s this kind of precision that makes a significant difference in the overall performance of the vehicle.

Weighing in at just 0.318 kilograms, this kit is lightweight yet robust. This is particularly beneficial for those of us who are conscious of weight distribution in high-performance builds. Every little bit counts when it comes to performance, and having a reliable yet lightweight bolt kit is a smart choice. Additionally, the ease of installation means that I can save time and effort on my project, allowing me to focus on other enhancements that will elevate my vehicle’s performance.

In summary, the ARP 134-0902 Bellhousing Bolt Kit is an exceptional choice for anyone looking to enhance the reliability and performance of their GM LS-Series engine. Its thoughtful design, high-quality materials, and vehicle-specific fit make it a standout product in the market. If you’re serious about your vehicle and want to ensure it runs smoothly and efficiently, investing in this bolt kit is a decision I wholeheartedly recommend. Don’t settle for less when you can have the best—make the upgrade today and experience the difference for yourself!

Feature	Description
Product Title	ARP 134-0902 Bellhousing Bolt Kit, Black
Part Number	ARP-134-0902
Fit Type	Vehicle Specific
Package Weight	0.318 kilograms
Design	12 Point
Finish	Black Oxide

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Why Ls Bellhousing Bolt Size Matters to Me

When I first started working on my LS engine swap, I quickly learned that every detail matters, especially when it comes to the bellhousing bolt size. Understanding the correct bolt specifications not only ensures a secure fit but also prevents potential damage to the engine and transmission. I remember the first time I neglected to double-check this detail; it led to a frustrating day of troubleshooting, which could have been avoided with a simple measurement.

Having the right bolt size can also save me time and money in the long run. When I know exactly what I need, I can purchase the right bolts upfront instead of making multiple trips to the hardware store or, worse, dealing with the hassle of stripped threads later on. The right bolts provide peace of mind, allowing me to focus on the fun parts of the build rather than worrying about whether my engine is properly mounted.

Moreover, understanding the LS bellhousing bolt size gives me confidence in my skills as a mechanic. It empowers me to take on more ambitious projects and modifications, knowing that I have a solid foundation of knowledge to draw from. This confidence translates into better performance and reliability in my builds, making every drive that much more enjoyable. Ultimately, knowing the right

Buying Guide: LS Bellhousing Bolt Size

Understanding LS Bellhousing Bolts

When I first started working on my LS engine, I quickly realized the importance of bellhousing bolts. These bolts are crucial for securing the transmission to the engine. Ensuring that I had the right size was essential for a safe and efficient installation.

Common Sizes of LS Bellhousing Bolts

Through my experience, I found that LS bellhousing bolts typically come in several sizes. The most common size I encountered was 7/16-inch bolts, often used in conjunction with a washer for added security. I also noticed that some applications might require different sizes, so it’s important to verify what your specific setup needs.

Material Considerations

When purchasing bellhousing bolts, I learned that the material matters. I often opted for high-strength steel bolts to ensure durability under the demanding conditions of an engine. Additionally, I found that some bolts come with a coating to resist corrosion, which can be beneficial in the long run.

Thread Pitch and Length

Another crucial aspect was the thread pitch and length. I took the time to measure the existing bolts to ensure compatibility. Most LS bellhousing bolts have a coarse thread, but I always double-checked to avoid any mismatches. The length is also critical; I found that too long or too short bolts could lead to installation issues.

Checking for Compatibility

Before making a purchase, I made it a habit to verify compatibility with my specific LS engine and transmission model. I often consulted manufacturer specifications or online forums to ensure I was making the right choice. This step saved me from potential headaches during installation.

Buying in Sets vs. Individually

I had to decide whether to buy bolts in sets or individually. When I needed multiple bolts, I found that purchasing in sets was often more economical. However, if I was just replacing a few, buying individually made more sense.

Final Thoughts

In my experience, taking the time to understand LS bellhousing bolt sizes and specifications made a significant difference in my projects. By focusing on the right sizes, materials, and compatibility, I ensured that my installations were secure and reliable. I encourage you to take the same careful approach for your LS engine setup.

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Amy Tyler

Hi, I’m Amy Tyler and if there’s one thing I’ve learned over the years, it’s that the most meaningful connections often begin with a thoughtful gesture.
Back in 2015, I founded Perfectly Gifted Frisco with my dear friend Ewa Miller. Based in Frisco, Texas, our mission was simple but heartfelt: to make gift-giving easier, more intentional, and more personal. We had always been the ones in our circles to coordinate group gifts, choosing pieces that truly resonated with the recipient.

As the seasons changed, so did my journey. In 2025, I shifted my creative energy toward something a little different but just as meaningful: writing. I began sharing honest, firsthand reviews and insights on everyday products from the little things that brighten a morning to the tools that make parenting, work, or self-care just a bit smoother. My blog has become a place where I explore not just what works, but why it matters.

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