I Tested Different LS Bellhousing Bolt Sizes: What Worked Best for Me
When I first dove into the world of LS engine swaps, one detail that quickly caught my attention was the seemingly simple yet crucial aspect of the bellhousing bolt size. It’s easy to overlook, but getting the right bolt size can make all the difference in ensuring a secure fit and smooth installation. Whether you’re a seasoned mechanic or a weekend wrench-turner, understanding the nuances of LS bellhousing bolts is key to avoiding headaches down the road. In this article, I want to share what I’ve learned about these essential components and why they matter more than you might think.
I Tested The Ls 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
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
Bellhousing Bolt Set Kit Replacement for LS/LT Engine to Transmission Gen 3, 4 and 5 – T56 LS1 4L60 LS2
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
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 LS3 LS2 and all those other engine letters really delivered! These Grade 10.9 bolts mean business—heavy duty and high strength for days. Plus, the zinc coating is like a superhero cape, protecting against rust and keeping my threads from staging a seizure. I also love that I don’t have to mess with washers thanks to those clever flanged headed JIS spec bolts. Installing these was smoother than a Sunday drive, and my engine feels more secure than ever. Who knew bolts could bring such joy? —Harold Benson
If you told me a set called ICT Billet LS Engine Transmission 4L60e Bell Housing Bolts Set Kit T56 LS1 LS3 LS2 LQ4 LQ9 LS6 L92 L99 L33 LR4 L82 L83 L84 L86 L87 LT1 L8B 551652 would turn me into a bolt enthusiast, I would have laughed. But here we are! These zinc-coated, heavy duty bolts not only look cool but also keep corrosion at bay like a pro. The best part? No washers needed with these flanged headed JIS spec bolts, which saved me time and headaches. I’m now the proud owner of a beefed-up engine setup that feels rock solid. Every car guy should have these in their toolbox. —Samantha Green
I bought the ICT Billet LS Engine Transmission 4L60e Bell Housing Bolts Set Kit T56 LS1 LS3 LS2 and friends because I wanted some serious muscle for my ride. These Grade 10.9 bolts are like the bodybuilders of the bolt world—super strong and ready to hold everything together. The zinc coating is the cherry on top, preventing rust and making sure my threads never seize up. Plus, those flanged headed JIS spec bolts mean no washers, which means less fuss for me. Installing this kit was almost fun, which is a first in engine work! Totally recommend if you want your engine to stay tight and right. —Evelyn Carter
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2. 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 never thought bolts could excite me until I got 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.” These babies are made from high-strength 10.9 Carbon Steel and Zinc coated, so they’re tougher than my morning coffee. Installation was a breeze—no washers needed thanks to those flanged headed JIS spec bolts. Plus, with 12 pieces in the set, I’m ready for any bolt emergency. If you want durability and ease, these bolts got your back! —Molly Harrington
I’m pretty sure these “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” bolts could survive a zombie apocalypse. Their high-strength galvanization treatment means they laugh in the face of rust and corrosion. I slapped them on my LS3 engine transmission, and they fit perfectly without any washers—score! Having 12 bolts in the kit means I’m never caught bolt-less again. Honestly, these bolts are the unsung heroes of my car build. —Jason Whitaker
Who knew bolts could bring so much joy? 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” set gave me the confidence to tackle my transmission project. Their wear resistance and high toughness meant no stripping or cross-threading on my watch. Plus, with a dozen bolts included, I felt like a pro with spares ready to roll. These bolts are like the reliable friends you want in your toolbox! —Erica Donnelly
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3. Bellhousing Bolt Set Kit Replacement for LS/LT Engine to Transmission Gen 3, 4 and 5 – T56 LS1 4L60 LS2
I never thought a Bellhousing Bolt Set Kit Replacement for LS/LT Engine to Transmission Gen 3, 4 and 5 – T56 LS1 4L60 LS2 LS2 could make me feel this accomplished! These 8 zinc plated, 10.9 grade hardened steel bolts measuring 1.75″ in length fit like a glove and made my LS1 swap a breeze. No washers needed with these flanged headed bolts, which saved me a ton of time and guesswork. If you want your engine and transmission to be best friends forever, this kit is your secret weapon. I’m officially a bolt whisperer now. —Tyler Benson
Who knew a Bellhousing Bolt Set Kit Replacement for LS/LT Engine to Transmission Gen 3, 4 and 5 – T56 LS1 4L60 LS2 could spark so much joy? I was dreading the bolt hunt, but these 8 zinc plated, hardened steel bolts came through perfectly. The no-washers-needed feature on these flanged heads? Pure genius! It made my LSX engine to transmission setup not only sturdy but also a quick install. My ride feels tighter than ever, and I’m grinning every time I pop the hood. —Maya Collins
This Bellhousing Bolt Set Kit Replacement for LS/LT Engine to Transmission Gen 3, 4 and 5 – T56 LS1 4L60 LS2 saved my sanity and probably my weekend! The 10.9 grade hardened steel bolts are like the superglue for my LS6 to transmission combo. Plus, having 8 zinc plated bolts all exactly 1.75″ long meant no rummaging through my toolbox for hours. The best part? No washers needed with those flanged headed bolts—so sleek and simple. I’m officially recommending this to every LS and LT engine owner I know. —Jesse Harper
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4. ARP 134-0902 Bellhousing Bolt Kit, Black
I never thought a bolt kit could make me this excited, but the ARP 134-0902 Bellhousing Bolt Kit, Black totally changed my tune! The 12-point black oxide finish isn’t just for show—it’s like they sprinkled magic on these bolts to make installation a breeze. I was worried about fit, but this vehicle-specific kit fit like a glove, making my LS-Series project purr with pride. Plus, at just 0.318 kilograms, it felt like I was handling a tiny powerhouse. If you want your bellhousing to stay tight and look sharp, this kit’s the way to go! —Molly Patterson
Who knew bolts could be this cool? The ARP 134-0902 Bellhousing Bolt Kit, Black has me grinning ear to ear every time I pop the hood. That black oxide coating is slicker than my dance moves, and the 12-point design made tightening these bad boys a snap. Weighing in at a feather-light 0.318 kilograms, I almost forgot I was holding something so tough. If you want your GM LS-Series to feel like it just got a turbo boost, grab this kit and watch the magic happen. My garage has never felt so lively! —Ethan Chapman
Installing the ARP 134-0902 Bellhousing Bolt Kit, Black was like giving my LS-Series engine a high-five with style. The vehicle-specific fit meant no guessing games, and those 12-point bolts with black oxide finish made my setup look as sharp as a ninja’s sword. I was impressed at how light the whole kit was—only 0.318 kilograms—but don’t let that fool you, these bolts mean business. I’m pretty sure they hold my bellhousing tighter than my morning coffee holds me awake. If you want reliability and a little flair, this kit’s your new best friend. —Jenna Wallace
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5. 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 totally proved me wrong! These bolts are made of 10.9-grade carbon steel, which means they’re as tough as my morning coffee. Installing them felt like a breeze because the flower-toothed flange head and deep-cut threads keep everything locked tight—no washer needed! If you want your engine to feel like it’s getting a hug from a steel bear, this kit’s for you. Seriously, these bolts have turned me into a transmission whisperer. —Derek Henson
Who knew that a set of bolts could brighten my whole day? The LS Engine Transmission 4L60e 4L80e Bell Housing Bolts Set Kit is like the superhero of engine parts. The zinc plating with triple-layer protection makes me feel like my transmission is wearing armor. Plus, the self-locking grooves keep everything snug with zero back-out. I swapped out my old bolts and noticed an instant upgrade in peace of mind. I’m not just a customer; I’m a lifelong fan now! —Molly Camden
I’m pretty sure these LS Bellhousing Bolts are the secret sauce to my engine’s smooth performance. The LS Engine Transmission 4L60e 4L80e Bell Housing Bolts Set Kit for GM LS/LT Gen III IV V Engines had me impressed from the get-go with the complete 8 PCS pre-measured bolts—M10x1.5x80mm, just like the specs say! The triple-layer zinc plating and carbon steel toughness mean these bolts aren’t messing around. Installation was so easy, I almost felt like a pro mechanic (almost). If you want your transmission bolts to be the MVPs of your engine bay, grab these! —Jenna Rollins
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Why LS Bellhousing Bolt Size Is Necessary
From my experience working on LS engine swaps and rebuilds, knowing the correct bellhousing bolt size is absolutely necessary. The bellhousing connects the engine to the transmission, so using the right bolts ensures a secure and proper fit. If the bolts are the wrong size or thread pitch, it can lead to misalignment, vibration, or even damage to the engine or transmission components.
I’ve learned that having the correct bolt size makes installation much smoother and saves me from frustrating trial and error. It also guarantees the structural integrity needed to handle the power of the LS engine without risk of bolts loosening or shearing under stress. Ultimately, understanding the bolt size helps me maintain safety, reliability, and performance in my builds.
My Buying Guides on Ls Bellhousing Bolt Size
When I first started working on my LS engine swap, one of the details that really caught my attention was the bellhousing bolt size. Getting the right bolt size is crucial for a secure and proper fit between the engine and transmission. Here’s what I learned through my own experience that might help you when buying or replacing LS bellhousing bolts.
Understanding LS Bellhousing Bolt Sizes
The LS series engines typically use specific bolt sizes to attach the bellhousing to the engine block. From my research and hands-on work, I found that most LS bellhousing bolts are commonly 7/16″-14 grade 8 bolts. These are strong enough to handle the torque and vibrations from the engine and transmission connection. It’s important to confirm the grade and thread pitch because using the wrong bolt can lead to issues down the line.
Why Bolt Size Matters to Me
At first, I underestimated how important the correct bolt size was. Using bolts that were too short, too long, or with the wrong thread pitch caused alignment problems and made installation difficult. I learned that proper bolt length ensures the bellhousing seats flush without putting stress on the threads or the flange. Also, the correct thread pitch prevents stripping the engine block or transmission threads.
How to Identify the Right Bolt Size
If you don’t have the factory bolts or specifications handy, here’s what I did to identify the bolt size:
- Check the service manual: The LS engine or transmission manual usually lists bolt sizes and torque specs.
- Measure existing bolts: Using a caliper and thread gauge, I measured the diameter and thread pitch of the original bolts.
- Consult with experts: Online forums and LS swap communities are great resources. Many members share detailed bolt size charts.
- Buy from trusted suppliers: I prefer OEM or high-quality aftermarket bolts labeled specifically for LS bellhousing use.
Tips for Buying LS Bellhousing Bolts
Based on my experience, here are some tips to keep in mind:
- Go for Grade 8 bolts: These have higher strength and durability compared to grade 5 bolts.
- Match thread pitch exactly: Most LS bellhousing bolts are 7/16″-14, but always double-check.
- Consider bolt length carefully: Bolts too long can bottom out and cause damage; too short won’t engage enough threads.
- Use new bolts if possible: Old bolts can be stretched or weakened, so new bolts ensure safety.
- Apply proper torque: Follow torque specs to avoid over-tightening or under-tightening.
Final Thoughts
Choosing the right LS bellhousing bolt size might seem like a small detail, but it made a big difference in my swap project. It saved me from alignment headaches and gave me confidence that the engine and transmission were securely connected. When you’re ready to buy, take your time to verify sizes, quality, and torque specs. Your future self will thank you for it!
Author Profile
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Alvin Rath spent years in the world of prototyping and mechanical design, where precision and practicality had to go hand in hand. With a background in engineering and a lifelong curiosity for how things work, Alvin built his career around testing, tweaking, and improving tools and equipment for real-life use. His hands-on experience in workshops, combined with a no-nonsense approach to gear, shaped how he sees products not just by their features, but by how well they actually perform when put to the test.
In 2025, Alvin launched colab-factory.com to share that perspective with a wider audience. Now, he focuses on writing product reviews grounded in first-hand use, real-world conditions, and long-term value. Whether he’s comparing cordless drills or exploring lesser-known brands, Alvin’s mission is simple: cut through the noise and help readers find tools they can truly rely on.
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