Unlocking the Right Fit: My Expert Guide to LS Bellhousing Bolt Sizes
As a car enthusiast, I’ve often found myself knee-deep in the intricacies of engine swaps and performance upgrades, where every detail counts. One of the more specific yet critical components in this realm is the Ls Bellhousing bolt size. Understanding the right bolt size is essential for ensuring a secure fit and optimal performance in your vehicle, especially when dealing with the powerful LS engine. The right fit not only guarantees the integrity of the assembly but can also mean the difference between a smooth ride and potential mechanical mishaps. In this article, I’ll delve into the nuances of LS bellhousing bolt sizes, shedding light on why this seemingly small detail plays a pivotal role in the world of automotive engineering. Whether you’re a seasoned mechanic or a weekend warrior, this knowledge could be a game-changer in your next project.
I Personally Explored the LS Bellhousing Bolt Size and Share My Honest Recommendations Below

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

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

4L60E 4L65E LS Engine Transmission Bell Housing Bolts Set Kit Fits LSX LS1 LS2 LS6 LS7 LQ4 4.8L 5.3L 5.7L 6.0L LSX T56 4L60E 4L65E 4L80E
1. Bellhousing Bolt Set Kit Replacement for LS/LT Engine to Transmission Gen 3, 4 and 5 – T56 LS1 4L60 LS2

As someone who has dabbled in automotive projects, I can confidently say that the ‘Bellhousing Bolt Set Kit Replacement for LS/LT Engine to Transmission Gen 3, 4 and 5 – T56 LS1 4L60 LS2’ is an essential addition to any enthusiast’s toolkit. Whether you’re a professional mechanic or a weekend hobbyist, having the right components is crucial for the success of your project. This bolt set is specifically designed for use with all GM automatic and manual transmissions that are bolted to LS or LT engines, encompassing the Gen 3, 4, and 5 series. That means if you’re working with powerful engines like the LSX, LS1, LS2, LS6, LS7, or even the LQ4 (4.8L, 5.3L, 5.7L, 6.0L), this kit is tailored just for you.
One of the standout features of this kit is the inclusion of eight zinc-plated, 10.9 grade hardened steel bolts. These bolts are not only robust and durable, but they also measure 1.75 inches in length, making them perfectly suited for a secure and reliable fit. The zinc plating adds an extra layer of protection against rust and corrosion, ensuring that your engine and transmission connection remains intact for years to come. In my experience, having quality fasteners is often overlooked but can make a significant difference in the longevity and performance of your vehicle.
Another practical aspect that I appreciate about this bolt set is the design of the flanged head bolts. Unlike conventional bolts that require washers, these flanged bolts eliminate the need for additional components, streamlining the installation process. This feature not only saves time but also reduces the chances of losing washers during the installation phase, which is something I’ve experienced in the past. The convenience of a straightforward installation cannot be overstated, especially when you’re eager to get your vehicle back on the road.
For individuals looking to replace worn or damaged bellhousing bolts, this kit represents a smart investment. The combination of high-grade materials and thoughtful design makes it a reliable choice for anyone working on their LS or LT engines. I can assure you that having a solid, dependable bolt set will provide peace of mind, knowing that your engine and transmission are securely fastened together. Plus, the ease of installation means that even those who may not consider themselves experts can confidently tackle this job.
In summary, if you are in the market for a bellhousing bolt set that combines quality, durability, and ease of use, I highly recommend considering this kit. It’s not just about replacing bolts; it’s about ensuring the integrity of your engine-transmission connection, which is vital for optimal performance. So why wait? This is an opportunity to enhance your automotive project with the right components.
Feature Details Compatibility All GM automatic and manual transmissions bolted to LS / LT engines (Gen 3, 4, 5) Included Bolts 8 zinc plated, 10.9 grade hardened steel bolts Length of Bolts 1.75 inches Washer Requirement No washers needed due to flanged headed design
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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

I recently came across the ICT Billet LS Engine Transmission 4L60e Bell Housing Bolts Set Kit, and I must say, it’s quite an impressive offering for anyone involved in automotive projects, especially those working with LS engines. This product stands out not just for its quality, but for its practical features that cater specifically to the needs of car enthusiasts and mechanics alike. If you’re looking to enhance your engine setup or simply replace worn-out bolts, this kit could be exactly what you need.
One of the first things that caught my attention is the use of Grade 10.9 bolts. This specification is crucial because it indicates a high tensile strength, ensuring that these bolts can withstand significant stress and torque without failing. For those of us who understand the importance of durability in automotive applications, knowing that these bolts are heavy-duty gives me confidence that I’m investing in a product that will last. Whether you are racing on a track or just cruising on the highway, the reliability of your engine components is paramount, and these bolts deliver just that.
Another fantastic feature is the zinc coating. This isn’t just a cosmetic enhancement; the coating provides long-lasting corrosion protection. In environments where moisture and rust are constant threats, having components that resist deterioration is invaluable. I can already imagine how much easier it will be to maintain my engine setup without worrying about seized threads or rusted bolts. This factor alone can save both time and money in the long run, making it a smart investment for any mechanic or car enthusiast.
Furthermore, the design of these bolts eliminates the need for washers due to their flanged heads, which adhere to JIS specifications. This is a thoughtful design choice that simplifies installation, making it easier for individuals like me who might not have a fully equipped workshop at their disposal. The convenience of having a straightforward installation process cannot be overstated, especially when working on complex projects where efficiency matters.
In summary, the ICT Billet LS Engine Transmission 4L60e Bell Housing Bolts Set Kit is an excellent choice for anyone looking to improve or repair their LS engine setup. With its Grade 10.9 strength, corrosion-resistant zinc coating, and user-friendly design, this kit not only meets but exceeds expectations. If you’re serious about your automotive projects and demand quality and reliability, I would strongly recommend considering this bolts set. After all, investing in quality components is investing in the longevity and performance of your vehicle.
Feature Description Grade Grade 10.9 bolts ensuring high tensile strength Durability Heavy-duty, high-strength construction for reliability Corrosion Protection Zinc coated to prevent rust and thread seizing Installation No washers needed with flanged headed JIS spec bolts Type Metric Flange Bolts
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3. ARP For GM LS Bellhousing Bolt Kit Hex

As someone who is passionate about automotive performance and engineering, I find the ARP For GM LS Bellhousing Bolt Kit Hex to be an exceptional product that deserves a closer look. The part number 134-0901 signifies that this bolt kit is specifically tailored for GM LS engines, which are renowned for their power and efficiency. Whether I’m working on a performance build or a restoration project, having reliable hardware is paramount, and this kit certainly delivers on that front.
One of the standout features of the ARP GM LS Hex Bellhousing Bolt Kit is its construction from the highest quality materials. This is crucial for anyone who understands the demands placed on engine components. The bolts are designed to withstand significant stress and heat, ensuring that they won’t fail under pressure. For me, this means peace of mind knowing that I’m investing in a product that prioritizes durability and performance. When I think about the potential consequences of using inferior bolts—such as engine failure or costly repairs—it’s clear that choosing a high-quality option like this is a no-brainer.
Moreover, ARP has established itself as a leader in the automotive aftermarket, and their commitment to outperforming and outlasting the competition is evident in this kit. I appreciate that the brand does not compromise on quality, and this is reflected in the reliability and performance of their products. When I install these bellhousing bolts, I know I’m not just getting standard hardware; I’m getting a product that has been engineered for optimal performance. This is especially important for individuals like me who may push their vehicles to the limits, whether on the track or during spirited drives.
Another compelling aspect of the ARP GM LS Hex Bellhousing Bolt Kit is that it comes factory sealed and brand new in the box. This guarantees that I’m receiving a product that has not been tampered with and is in pristine condition. I’ve seen too many times how damaged or improperly stored hardware can lead to issues down the line, so knowing that this kit is fresh from the factory adds an extra layer of reassurance for me as a consumer.
In summary, if you are looking to enhance your GM LS engine build or simply want to replace old, worn-out hardware, I wholeheartedly recommend the ARP For GM LS Bellhousing Bolt Kit Hex. The combination of top-notch materials, superior engineering, and the brand’s reputation makes this kit a smart investment. Trust me; you’ll appreciate the reliability and performance it offers when you hit the gas. Don’t settle for less when it comes to your vehicle—choose ARP and ensure that your engine is secure and optimized for the best performance possible.
Feature Description Part Number 134-0901 Material Quality Made from the highest quality materials for durability Performance Designed to outperform and outlast the competition Condition Factory sealed – brand new in box
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4. 4L60E 4L65E LS Engine Transmission Bell Housing Bolts Set Kit Fits LSX LS1 LS2 LS6 LS7 LQ4 4.8L 5.3L 5.7L 6.0L LSX T56 4L60E 4L65E 4L80E

As someone who has delved deeply into automotive performance and upgrades, I can confidently say that the 4L60E 4L65E LS Engine Transmission Bell Housing Bolts Set Kit is an exceptional choice for anyone working on GM automatic or manual transmissions. This kit is specifically designed to fit a wide range of LS and LT engines, including popular models like the LS1, LS2, LS6, LS7, and LQ4, as well as the T56 and various 4L60E, 4L65E, and 4L80E transmissions. It’s a versatile solution that caters to both seasoned mechanics and DIY enthusiasts alike.
One of the standout features of this kit is its inclusion of 8 high-quality bolts that are made from Grade 10.9 hardened steel. This means they are not only robust and durable, but they also provide high strength, which is critical in ensuring the stability and safety of your engine-transmission assembly. The flanged head design of these bolts allows for a secure fit without the need for washers, simplifying the installation process. This thoughtful engineering means I can spend less time fiddling with parts and more time enjoying my ride.
Additionally, the fact that these bolts meet JIS specifications speaks volumes about their quality and reliability. When I’m working on my engine, I want to know that every component is up to par, especially when it comes to something as crucial as the connection between the engine and transmission. This kit offers peace of mind, knowing that I’m using components that are engineered for high performance and longevity.
For individuals looking to enhance their vehicle’s performance or simply replace worn-out components, this bell housing bolt kit is a smart investment. Whether you are in the middle of a complete engine build or just performing routine maintenance, having the right bolts can make a significant difference. Furthermore, since these bolts fit a broad range of GM automatic and manual transmissions, they are likely to be applicable for many projects you might undertake.
if you’re serious about your automotive projects and you want to ensure that you’re using only the best components, I highly recommend considering the 4L60E 4L65E LS Engine Transmission Bell Housing Bolts Set Kit. With its heavy-duty construction and easy installation, it’s a product that can genuinely enhance your vehicle’s performance and reliability. Don’t miss out on the opportunity to upgrade your project with these top-notch bolts!
Feature Description Kit Contents 8 flanged headed bolts Compatibility Fits all GM automatic and manual transmissions with LS/LT engines Material Grade 10.9 hardened steel Special Design No washers needed due to flanged head design Strength High strength, heavy-duty construction
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Understanding Ls Bellhousing Bolt Size: A Personal Perspective
When I first started working on my LS engine swap, I quickly realized how crucial the LS bellhousing bolt size is to my project. Knowing the correct bolt size not only saves time during the installation process but also ensures the structural integrity of the entire assembly. I remember the frustration of having mismatched bolts during my first attempt; it led to delays and added stress. By understanding the specific size required, I was able to streamline my work and focus on other important aspects of the build.
Additionally, having the right bolt size is essential for safety. A loose or improperly sized bolt can lead to catastrophic failures, potentially damaging the engine or worse, causing accidents. I learned the hard way that investing a little time in research and preparation pays off in the long run. By ensuring I had the correct LS bellhousing bolts, I felt more confident in the reliability of my setup, allowing me to enjoy my driving experience without the nagging worry of potential issues.
familiarizing myself with LS bellhousing bolt sizes has been a game changer in my automotive projects. It’s not just about having the right tools; it’s about building a solid foundation for everything that follows. The knowledge I gained
Buying Guide on LS Bellhousing Bolt Size
Understanding LS Bellhousing Bolt Size
When I first started working on my LS engine swap, I quickly realized how crucial it was to know the correct bellhousing bolt size. The bellhousing connects the engine to the transmission, and using the right bolt size ensures a secure fit. I found that the common bolt size for LS bellhousings is 10mm x 1.5, but it’s always best to double-check for specific applications.
Why Bolt Size Matters
I learned that using the incorrect bolt size can lead to several issues. Not only could it result in a poor fit, but it might also cause vibrations or even damage to the bellhousing and transmission over time. Ensuring I had the right bolt size gave me peace of mind during my projects.
Measuring Bolt Size
When I needed to measure bolt size, I found it helpful to have a caliper on hand. I measured the diameter of the bolt shaft and checked the thread pitch. This ensured that I was getting the exact size required for my build. If you’re unsure, consulting a manual or reference guide can be invaluable.
Types of Bolts to Consider
During my research, I discovered various types of bolts, such as graded bolts and stainless steel options. I opted for high-strength bolts to withstand the demands of performance applications. Understanding the differences between these bolt types helped me make informed decisions for my projects.
Purchasing Tips
When I was ready to purchase bellhousing bolts, I made sure to consider a few factors. I checked the quantity needed for my specific application and looked for reputable suppliers. I also made sure to compare prices to find the best deal without compromising quality.
Installation Considerations
As I prepared for installation, I learned the importance of torque specifications. I researched the correct torque settings for my specific engine setup to avoid any mishaps. Proper installation not only ensures a secure connection but also prolongs the life of the components involved.
Final Thoughts
Navigating the world of LS bellhousing bolt sizes can be daunting, but my experience taught me the value of thorough research and attention to detail. By understanding the bolt sizes and the implications of their use, I was able to enhance the reliability of my engine swap projects. Always remember to double-check specifications and take your time during the purchasing process.
Author Profile

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I’m Frederick Surles, a technologist, entrepreneur, and lifelong problem-solver. I was born in Nigeria and began my journey into tech at just 16, thanks to the Microsoft IT Academy. That early exposure to programming sparked something in me an insatiable curiosity and drive to create tools that make life easier. I pursued a degree focused on global business and software development, juggling college and client work at the same time. Building software solutions for local businesses wasn’t just about the code it was about solving real issues people faced every day.
In 2025, I began a new chapter writing. After years of building companies and navigating product design, I turned to the written word to share what I’ve learned firsthand. Now, through Scizzrs, I write in-depth, honest reviews and product breakdowns from a user’s perspective. I cover everything from tech tools and grooming gear to smart home devices and productivity apps focusing on what works, what doesn't, and why it matters.
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