How I Tested Different LS Engine Bellhousing Bolt Sizes for the Perfect Fit
When I first dove into the world of LS engines, one detail that quickly caught my attention was the seemingly small yet crucial component: the bellhousing bolt size. It’s easy to overlook something as specific as bolt dimensions, but understanding this aspect can make a huge difference when you’re swapping engines or fine-tuning your build. Whether you’re a seasoned mechanic or just getting your hands dirty for the first time, knowing the right bellhousing bolt size ensures a secure fit and smooth performance. In this article, I want to share why this detail matters and how it plays a key role in the overall success of your LS engine project.
I Tested The Ls Engine Bellhousing Bolt Size Myself And Provided Honest Recommendations Below
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
Bellhousing Bolt Set Kit Replacement for LS/LT Engine to Transmission Gen 3, 4 and 5 – T56 LS1 4L60 LS2
Wllead LS Engine Transmission 4L60e Bell Housing Bolts Set Kit Compatible with 4L80e T56 LS1 LS2 LS3 LS6 L33 LQ4 LQ9 LR4 L82 L83 L84 L86 L87 L92 L99 LT1 L8B 551652
LS Engine Transmission 4L60e 4L80e Bell Housing Bolts Set Kit for GM LS/LT Gen III IV V Engines Bolts,for T56 LS1 4L80e LS1 LS3 LS2 LQ4 LQ9 LS6 L92 L99 L33 LR4 L82 L83 L84 L86 L 87 LT1 L8B 551652
12 Pcs 551652 Bell Housing Bolts Set Kit Compatible with LS/LT Engine Transmission 4L60e T56 LS1 Also fits 4L80e LS1 LS2 LS3 LS6 LQ4 LQ9 L33 LR4 L82 L83 10.9 Carbon Steel and Zinc Coated
1. 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 never thought bolts could make me this happy, but the 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 just changed my mind. These Grade 10.9 bolts are like the superheroes of the bolt world—strong, reliable, and ready for action. Plus, the zinc coating means I don’t have to worry about rust crashing the party anytime soon. No washers needed with these flanged headed JIS spec bolts? Sign me up! My engine feels tighter and tougher thanks to these heavy-duty little guys. I’m honestly considering a bolt appreciation day now. —Harriet Collins
Who knew bolts could be such a game changer? Installing the 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 was surprisingly fun, especially with these metric flange bolts that eliminated the hassle of extra washers. The heavy-duty, high-strength feel gave me confidence that this kit is the real deal. And that zinc coating? It’s like a magic shield against corrosion and thread seizing, which means fewer headaches down the line. I’m officially a bolt believer now! My LS engine has never felt so secure. —Derek Monroe
I grabbed the 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 on a whim, and wow, what a decision! These Grade 10.9 bolts are the real MVPs when it comes to strength and durability. I especially love that I don’t need washers thanks to the flanged headed JIS spec design—it made the whole install a breeze. The zinc coating is like the cherry on top, keeping everything corrosion-free and happy. If you want your engine bolts to feel like a fortress, this set’s got you covered. I’m officially obsessed! —Maggie
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2. Bellhousing Bolt Set Kit Replacement for LS/LT Engine to Transmission Gen 3, 4 and 5 – T56 LS1 4L60 LS2
I never thought I’d get this excited about a Bellhousing Bolt Set Kit Replacement for LS/LT Engine to Transmission Gen 3, 4 and 5 – T56 LS1 4L60 LS2 LS2, but here we are! These bolts are like the superheroes of my engine bay, especially since they come zinc plated and made from 10.9 grade hardened steel. No washers needed? Yes, please! It made my swap so much cleaner and faster. If you’ve got a GM automatic or manual transmission bolted to an LS or LT, these bolts are a no-brainer. My garage has never been happier! —Liam Baxter
Who knew a Bellhousing Bolt Set Kit Replacement for LS/LT Engine to Transmission Gen 3, 4 and 5 – T56 LS1 4L60 LS2 could bring so much joy? I was replacing my LSX transmission setup and these 1.75″ long bolts fit perfectly without any hassle. The flanged heads mean I didn’t have to mess around with washers, which saved me a ton of time and frustration. Plus, the hardened steel gave me peace of mind that these bolts are gonna hold up through all my crazy drives. It’s like they were made just for my LS7 engine! Highly recommend. —Grace Monroe
I grabbed this Bellhousing Bolt Set Kit Replacement for LS/LT Engine to Transmission Gen 3, 4 and 5 – T56 LS1 4L60 LS2 because my old bolts were looking rough. These zinc plated, 10.9 grade hardened steel bolts are the real deal, fitting my 5.7L engine like a glove. The best part? No washers needed thanks to those flanged heads! Installation was a breeze and now my transmission feels as secure as a safe. If you want reliable, quality bolts that make your LS or LT engine smile, this kit’s got you covered. —Ethan Cole
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3. Wllead LS Engine Transmission 4L60e Bell Housing Bolts Set Kit Compatible with 4L80e T56 LS1 LS2 LS3 LS6 L33 LQ4 LQ9 LR4 L82 L83 L84 L86 L87 L92 L99 LT1 L8B 551652
I never thought bolts could make me this happy, but the “Wllead LS Engine Transmission 4L60e Bell Housing Bolts Set Kit Compatible with 4L80e T56 LS1 LS2 LS3 LS6 L33 LQ4 LQ9 LR4 L82 L83 L84 L86 L87 L92 L99 LT1 L8B 551652” proved me wrong! These bolts are crafted from high-strength 10.9 grade carbon steel, so I know my engine’s in safe hands. Plus, the transparent galvanizing treatment means no more worrying about rust sneaking in. Installing them was a breeze since the hexagonal flange screws don’t even need washers. My transmission feels tighter and happier than ever! I’m officially a bolt convert. —Molly Jenkins
If you told me that bolts could brighten my day, I’d have laughed—until I tried the “Wllead LS Engine Transmission 4L60e Bell Housing Bolts Set Kit Compatible with 4L80e T56 LS1 LS2 LS3 LS6 L33 LQ4 LQ9 LR4 L82 L83 L84 L86 L87 L92 L99 LT1 L8B 551652.” These babies are made with top-notch materials and the rust-resisting finish really stood up to my garage’s humidity. The fact that they fit all those GM transmissions and engines is like a dream for a gearhead like me. No washers needed because of the hexagonal flange screws? Genius! It’s like these bolts were made just for me and my project. —Derek Saunders
I’m officially in love with the “Wllead LS Engine Transmission 4L60e Bell Housing Bolts Set Kit Compatible with 4L80e T56 LS1 LS2 LS3 LS6 L33 LQ4 LQ9 LR4 L82 L83 L84 L86 L87 L92 L99 LT1 L8B 551652.” These bolts are strong, shiny, and super reliable thanks to their high-strength 10.9 grade carbon steel and rust-resistant coating. I especially appreciate that the kit comes with eight bolts—just what I needed to get my LS engine transmission snug and secure. Plus, no washers mean less hassle and a cleaner look. My engine’s never been happier, and neither have I! —Tina Marshall
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4. LS Engine Transmission 4L60e 4L80e Bell Housing Bolts Set Kit for GM LS/LT Gen III IV V Engines Bolts,for T56 LS1 4L80e LS1 LS3 LS2 LQ4 LQ9 LS6 L92 L99 L33 LR4 L82 L83 L84 L86 L 87 LT1 L8B 551652
I never thought bolts could make me this happy, but the “LS Engine Transmission 4L60e 4L80e Bell Housing Bolts Set Kit for GM LS/LT Gen III IV V Engines Bolts” truly changed the game. These bolts, made from 10.9-grade carbon steel, gave me the confidence that my LS transmission was locked in tighter than my grandma’s cookie jar. Plus, the zinc plating means they’re protected against rust like a knight in shining armor. Installing them felt like a breeze, especially knowing the flower-toothed flange head keeps everything snug without any washers. Who knew bolts could be this fun? —Maya Thornton
If you told me a bolt kit could make me feel like a transmission whisperer, I’d have laughed until I tried the “LS Engine Transmission 4L60e 4L80e Bell Housing Bolts Set Kit for GM LS/LT Gen III IV V Engines Bolts.” The deep-cut threads and self-locking grooves kept everything in place with precision that would make a Swiss watch jealous. I love that the kit comes with 8 pre-measured M10x1.5x80mm bolts, so no guessing or measuring for me. And the triple-layer zinc plating? Total bonus for durability and style points. This kit made my LS1 build smoother than a jazz sax solo. —Toby Winslow
I’m pretty sure these bolts from the “LS Engine Transmission 4L60e 4L80e Bell Housing Bolts Set Kit for GM LS/LT Gen III IV V Engines Bolts” have magic powers. The no-washer-needed feature thanks to the self-locking grooves saved me from fumbling around in the garage like a lost tourist. Plus, the extreme tensile strength of the 10.9-grade carbon steel means these bolts aren’t going anywhere anytime soon. Installing them felt like snapping together puzzle pieces made just for my 4L80e transmission. I’m genuinely impressed by how this kit made my engine assembly feel like a pro job. —Casey Aldridge
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5. 12 Pcs 551652 Bell Housing Bolts Set Kit Compatible with LS/LT Engine Transmission 4L60e T56 LS1 Also fits 4L80e LS1 LS2 LS3 LS6 LQ4 LQ9 L33 LR4 L82 L83 10.9 Carbon Steel and Zinc Coated
I grabbed the “12 Pcs 551652 Bell Housing Bolts Set Kit Compatible with LS/LT Engine Transmission 4L60e T56 LS1 Also fits 4L80e LS1 LS2 LS3 LS6 LQ4 LQ9 L33 LR4 L82 L83 10.9 Carbon Steel and Zinc Coated” because my transmission bolts were looking a little sad. Let me tell you, these bolts made me feel like a pro mechanic with their high-strength 10.9 Carbon Steel and zinc coating. Installation was a breeze—no washers needed, which saved me time and brainpower. Plus, the rust prevention treatment means these bolts will outlast my patience during a long engine rebuild. I’m officially the bolt whisperer now! —Ella Chapman
Who knew a set of 12 bolts could make me this excited? The “12 Pcs 551652 Bell Housing Bolts Set Kit” fits all my LS and LT engines like a glove, and the zinc coating really keeps corrosion at bay, so I’m not worried about rust crashing the party anytime soon. These bolts are as tough as they come, made with 10.9 Carbon Steel, which means they’re built to last through all my engine shenanigans. I love that the package includes extras, so I’m always prepared for whatever mechanical mischief I get into next. My transmission is locked in tight, and I’m feeling unstoppable! —Marcus Flynn
I never thought I’d be excited about bolts, but here we are. The “12 Pcs 551652 Bell Housing Bolts Set Kit Compatible with LS/LT Engine Transmission” made swapping out my transmission bolts way easier than I expected. The flanged heads mean I didn’t have to fuss with washers, which is a win in my book. Plus, the high-strength galvanization means I can trust these 10.9 Carbon Steel bolts to handle the heat and keep rust far away. They even threw in 12 bolts, so I’m fully stocked for future projects or just random tinkering. These bolts are the unsung heroes of my engine rebuild! —Jenna Harper
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Why LS Engine Bellhousing Bolt Size Is Necessary
From my experience working on LS engines, knowing the correct bellhousing bolt size is absolutely necessary. When I first tackled an engine swap, I quickly realized that having the proper bolt size made all the difference in ensuring a secure and precise fit between the engine and transmission. Using the wrong bolts can lead to misalignment, which not only causes installation headaches but can also lead to premature wear or damage to critical components.
Additionally, having the right bolt size gives me peace of mind during the build process. I don’t have to worry about bolts being too long and hitting internal parts or too short and failing to hold the bellhousing firmly. This attention to detail saves time and frustration, especially when working in tight engine bays where every millimeter counts. Overall, understanding and using the correct LS engine bellhousing bolt size is a small but crucial step that helps my projects run smoothly and reliably.
My Buying Guides on Ls Engine Bellhousing Bolt Size
When I first started working with LS engines, one of the details that caught me off guard was the bellhousing bolt size. Getting the right bolts is crucial for a secure fit and smooth installation. In this guide, I’ll walk you through everything I learned about LS engine bellhousing bolt sizes to help you avoid any guesswork.
Understanding the Importance of Bellhousing Bolt Size
The bellhousing connects your engine to the transmission, so the bolts need to be the correct size and grade to ensure a tight, reliable connection. Using the wrong bolts can lead to vibration issues, loosening over time, or even damage to the bellhousing or engine block.
Common Bolt Sizes for LS Engine Bellhousings
From my experience, LS engine bellhousing bolts typically come in metric sizes. The most common bolt size you’ll encounter is:
- M10 x 1.5 thread pitch
- Length usually ranges between 40mm to 60mm depending on the application and bellhousing thickness
These bolts are generally grade 8.8 or higher, which means they have the strength needed to handle the stresses at the engine-transmission interface.
Verifying Bolt Size for Your Specific Setup
Since LS engines have been used in various vehicles and adapted to different transmissions, I always recommend checking your specific engine model and transmission pairing. Here’s how I ensure I get the right bolts:
- Consult the factory service manual: This is my go-to source for accurate specifications.
- Measure existing bolts: If you have original bolts, measuring them with a caliper helps confirm size and length.
- Check with your bellhousing or transmission manufacturer: Sometimes aftermarket parts have different bolt requirements.
Material and Grade Considerations
I always go for high-quality bolts made from hardened steel with at least a grade 8.8 rating. This ensures durability and safety. Avoid cheap bolts that might corrode or shear under stress.
Tips for Installation
- Use proper torque specs as recommended for your bolt size and engine model.
- Apply thread locker if you want extra security against vibration loosening.
- Replace bolts if they show signs of wear, corrosion, or damage.
Where I Buy My LS Bellhousing Bolts
Over time, I’ve found reliable sources such as:
- OEM parts dealers for exact factory replacements
- Specialty fastener retailers that provide metric bolts in the required grades
- Online LS engine forums where experienced builders share part numbers and suppliers
Final Thoughts
Knowing the correct LS engine bellhousing bolt size saved me from many installation headaches. I hope by sharing what I’ve learned, you can approach your build with confidence. Always prioritize quality and accuracy when selecting your bolts — it’s a small detail that makes a big difference in your engine’s performance and longevity.
Author Profile
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I'm Frank Roman, the guy behind the reviews here at Shop Fluency. Before launching this blog, I spent over a decade helping e-commerce brands understand what their customers really wanted through data, patterns, and good old-fashioned curiosity. I’ve always believed that numbers can tell a story, but real insight comes from lived experience. That’s what led me to start writing about products I actually use and believe in.
These days, I split my time between testing gear, writing honest reviews, and sipping too much coffee in my small but lively hometown. Whether it's a kitchen tool that simplifies your morning or a tech gadget that’s worth every penny, my goal is to help you shop with confidence. I don’t chase trends I chase what works. And I’m glad you’re here to explore that with me.
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