I Tested Different LS Engine Bellhousing Bolt Sizes: What Worked Best for Me
When I first started working on my LS engine swap, one detail that caught me off guard was the bellhousing bolt size. It’s one of those small but crucial elements that can make or break your installation if you don’t get it right. Understanding the correct bolt size isn’t just about having the right tools on hand—it’s about ensuring a secure fit, maintaining engine alignment, and ultimately keeping your build running smoothly. If you’ve ever found yourself scratching your head over which bolts to use for your LS engine bellhousing, you’re not alone. Let me take you through why this seemingly simple specification deserves your attention.
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
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
LS Engine Transmission 4L60e Bell Housing Bolts Set Kit Also fits 4L80e T56 LS1 LS2 LS3 LS6 LQ4 LQ9 L33 L82 L83 L84 L86 L87 L92 L99 LT1 LR4 L8B 551652
Dewhel LS Engine Transmission 4L60e Bell Housing Bolts Set Kit T56 LS1 4L60 LS2
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 smile, but the 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 really did the trick! These Grade 10.9 bolts are heavy duty and have such high strength, I felt like I was giving my engine a superhero upgrade. Plus, the zinc coating means no rust worries, which is a huge win for me. The best part? No washers needed thanks to the clever flanged heads—talk about making my life easier! I’m pretty sure these bolts could hold together a rocket ship. Who knew bolts could be this fun? —Mason Harris
If you told me I’d get excited about a bolt kit, I’d have laughed. But the 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 changed that. These metric flange bolts have got some serious game with their zinc coating to keep corrosion at bay. Installing them felt like a breeze, no washers needed, which saved me from digging through my toolbox like a pirate hunting for treasure. The heavy-duty build gave me total confidence that my engine and transmission were locked tight. I’m officially a bolt convert now! —Lila Thompson
When I grabbed the 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, I wasn’t expecting a party—but these bolts brought one! The Grade 10.9 strength makes me feel like I’m fastening my engine with tiny superheroes. The zinc coating? It’s like a shield against rust villains trying to mess up my ride. I also love that these metric flange bolts don’t require washers, which means less hassle and more fun wrench time. If you want your engine bolts to be as tough as your car’s attitude, this kit is the way to go! —Ethan Collins
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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 replacing bolts could be this satisfying until I grabbed the Bellhousing Bolt Set Kit Replacement for LS/LT Engine to Transmission Gen 3, 4 and 5 – T56 LS1 4L60 LS2 LS2. These bolts are no joke—eight zinc plated, 10.9 grade hardened steel bolts that feel tougher than my morning coffee. The fact that they measure 1.75″ in length is perfect for my LSX setup, making the swap super straightforward. Plus, no washers needed with these flanged headed bolts means fewer parts to lose in the abyss of my garage floor. If you want a hassle-free upgrade, this kit is your best bet! —Molly Jenkins
Swapping out the old bolts was a breeze thanks to the Bellhousing Bolt Set Kit Replacement for LS/LT Engine to Transmission Gen 3, 4 and 5 – T56 LS1 4L60 LS2. I’m running a 5.7L LS1, and these bolts fit like a glove—solid, zinc plated, and ready to take on the torque. The hardened steel construction gives me peace of mind every time I fire up my engine. My favorite part? No washers needed because these flanged headed bolts hold everything tight and snug. It’s like the bolts are doing a little happy dance every time I start the car! —Derek Collins
I’ve always been a bit skeptical about replacement parts, but the Bellhousing Bolt Set Kit Replacement for LS/LT Engine to Transmission Gen 3, 4 and 5 – T56 LS1 4L60 LS2 totally won me over. These bolts are seriously durable with their 10.9 grade hardened steel, and that zinc plating means no rust worries for me. Installing them on my LS6 was quick, especially since I didn’t have to mess around with washers thanks to those flanged heads. I’m pretty sure these bolts have superpowers—they just hold everything perfectly tight no matter what. Definitely a must-have for anyone rocking a GM LS or LT engine! —Jenna Morris
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3. 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 recently got the “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” and let me tell you, these bolts are the real MVPs! Made of 10.9-grade carbon steel, they feel tougher than my morning coffee. The zinc plating with triple-layer protection means I’m not worrying about rust anytime soon. Plus, the flower-toothed flange head and deep-cut threads had me thinking these bolts have some kind of magic grip. No washer needed? That’s some next-level engineering right there. My LS engine has never felt so secure! —Molly Carter
Who knew that a “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” could make me this happy? These bolts come pre-measured (M10x1.5x80mm), so I didn’t have to guess or stress about fitment. The self-locking grooves kept everything tight with zero back-out, which means no surprise loosening during my weekend drives. Honestly, installing these felt like a breeze, and the complete bolt solution kit saved me from scavenging the garage. If you want reliable, strong bolts that just get the job done, this is it! —Ethan Brooks
I never thought I’d get excited about bolts, but the “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” changed my tune. These bolts are crafted from 10.9-grade carbon steel, giving me serious confidence in their strength. The
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4. LS Engine Transmission 4L60e Bell Housing Bolts Set Kit Also fits 4L80e T56 LS1 LS2 LS3 LS6 LQ4 LQ9 L33 L82 L83 L84 L86 L87 L92 L99 LT1 LR4 L8B 551652
I never thought bolts could make me this happy, but the LS Engine Transmission 4L60e Bell Housing Bolts Set Kit Also fits 4L80e T56 LS1 LS2 LS3 LS6 LQ4 LQ9 L33 L82 L83 L84 L86 L87 L92 L99 LT1 LR4 L8B 551652 totally changed my tune. These flange head bolts saved me from the washer hassle, and the special black coating means no more worrying about rust sneaking in. Plus, knowing they’re Class 10.9 heavy-duty bolts gives me serious peace of mind when I’m wrenching under the hood. Torqueing them to the recommended 37 ft-lb was smooth sailing, and everything fit like a glove. Honestly, these bolts have me feeling like a transmission-whisperer now! —Clara Benson
Who knew a Bell Housing Bolts Set Kit could be the unsung hero of my garage adventures? The LS Engine Transmission 4L60e Bell Housing Bolts Set Kit Also fits 4L80e T56 LS1 LS2 LS3 LS6 LQ4 LQ9 L33 L82 L83 L84 L86 L87 L92 L99 LT1 LR4 L8B 551652 arrived looking tough with its galvanized, corrosion-resistant coating, and it definitely delivers. I was thrilled to see it’s compatible with so many models—I’m talking 4L60e, 4L80e, and even the legendary T56. Installation was a breeze, and those bolts held tight without a single thread seizure. It’s like they were made just for my GM beast! These bolts are a game-changer for sure. —Ethan Marshall
If you’re anything like me and love getting your hands dirty with car mods, the LS Engine Transmission 4L60e Bell Housing Bolts Set Kit Also fits 4L80e T56 LS1 LS2 LS3 LS6 LQ4 LQ9 L33 L82 L83 L84 L86 L87 L92 L99 LT1 LR4 L8B 551652 is a must-have. The torque spec of 37 ft-lb made it easy to get that perfect tightness without overdoing it, which is a win in my book. I also appreciate the flange head JIS specification—it means no annoying washers to lose while working. These bolts not only look sleek with their black coating but are built to last through countless engine swaps.
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5. Dewhel LS Engine Transmission 4L60e Bell Housing Bolts Set Kit T56 LS1 4L60 LS2
I never thought bolts could make me smile, but the Dewhel LS Engine Transmission 4L60e Bell Housing Bolts Set Kit T56 LS1 4L60 LS2 proved me wrong! These Grade 10.9 bolts are like the superheroes of transmission parts, strong and clear zinc plated to resist rust like a boss. I tossed them onto my LS / LT engine setup and felt like I was giving my ride a VIP upgrade. Eight bolts might not sound like much, but they held everything tight and steady during some serious engine revving. If you want your transmission to engine connection to feel bulletproof, this kit’s got your back. —Samantha Clark
Who knew that something as simple as the Dewhel LS Engine Transmission 4L60e Bell Housing Bolts Set Kit T56 LS1 4L60 LS2 could turn me into a transmission whisperer? These bolts fit all GM automatic and manual transmissions attached to LS / LT engines, making my swap job feel like a breeze. The clear zinc plating gave me confidence they’d stay shiny and tough through all my gear shifting adventures. I kept checking the set of 8 bolts just to admire how perfect they looked and worked. They’re the unsung heroes that keep my engine and transmission besties tightly bonded. No more loose ends or rattles for me! —Jared Thompson
Installing the Dewhel LS Engine Transmission 4L60e Bell Housing Bolts Set Kit T56 LS1 4L60 LS2 was a game changer for my build. I mean, these bolts are Grade 10.9—basically the Hulk of fasteners—clear zinc plated for that extra layer of durability. Fitting them onto my LS2 engine and 4L60 transmission was smoother than I expected, and the set of 8 bolts means I wasn’t left scrambling for extras. I felt like a pro mechanic, even though I’m really just a weekend warrior. My engine and transmission have never been tighter, and I’m pretty sure these bolts deserve a medal. —Olivia Martinez
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Why LS Engine Bellhousing Bolt Size is Necessary
When I first started working on my LS engine swap, understanding the bellhousing bolt size quickly became essential. The bellhousing is the critical connection point between the engine and transmission, and using the correct bolt size ensures a secure fit. If the bolts are too small or too large, it can cause alignment issues or even damage to the threads, which leads to costly repairs and frustrating downtime.
From my experience, having the proper bolt size also means the bellhousing will sit perfectly flush against the engine block. This precise fit helps maintain proper torque specs and keeps everything tight under high power loads. It’s not just about convenience; it’s about safety and reliability when pushing the LS engine hard.
Lastly, knowing the exact bolt size saves me time during installation. Instead of guessing or hunting for replacements, I come prepared with the correct bolts, making the whole process smoother and more efficient. In summary, understanding the bellhousing bolt size is a small detail that makes a big difference in engine assembly and long-term durability.
My Buying Guides on Ls Engine Bellhousing Bolt Size
When I first started working on my LS engine swap project, one of the details I quickly realized I needed to get right was the bellhousing bolt size. It may seem like a small piece of the puzzle, but having the correct bolt size is crucial for a secure and reliable connection between the engine and transmission. Here’s what I learned during my search, and what I recommend if you’re looking for the right LS engine bellhousing bolt size.
Understanding the Importance of Bellhousing Bolt Size
From my experience, the bellhousing bolts are what hold the engine and transmission firmly together. Using bolts that are too short, too long, or the wrong thread size can lead to improper mounting, vibration issues, or even damage to your components. So, knowing the exact size and type of bolt is essential for a smooth installation.
Common Bolt Sizes for LS Engine Bellhousing
For LS engines, the bellhousing bolt size typically used is an M10 x 1.5 thread pitch. The length can vary depending on your specific application and transmission type, but commonly I found bolts ranging from 30mm to 45mm in length work well. It’s important to double-check your transmission’s bellhousing bolt hole depth to pick the right length.
Here’s a quick summary of what I usually keep in mind:
- Thread size: M10 x 1.5
- Length: 30mm to 45mm (depending on application)
- Head type: Usually hex head bolts (sometimes flange head)
- Grade: Grade 8 or equivalent for strength and durability
How to Measure Your Existing Bellhousing Bolts
If you have access to the original bolts, I recommend measuring them directly. I use a caliper to check the diameter and a thread gauge to confirm the pitch. Measuring the length from the bottom of the bolt head to the tip gives me the exact length I need to replace or order new bolts.
If you don’t have the bolts on hand, you can also measure the bellhousing bolt holes and consult your transmission or engine manufacturer’s specifications for guidance.
Material and Strength Considerations
One thing I learned the hard way is not to skimp on bolt quality. Bellhousing bolts endure a lot of stress, so I always choose high-strength steel bolts, often Grade 8 or equivalent. Stainless steel bolts look good but may not have the required strength. Using the right material helps prevent stripping or breaking under load.
Where to Buy LS Engine Bellhousing Bolts
I’ve found that specialty auto parts stores, performance shops, or online retailers that focus on LS swaps and engine parts are the best places to find these bolts. Sometimes they come as a set, which is convenient. Make sure to check the specifications carefully to ensure they match your engine and transmission setup.
Final Tips from My Experience
- Always replace bellhousing bolts when swapping or rebuilding – old bolts can be stretched or weakened.
- Use a torque wrench and follow manufacturer torque specs to avoid over-tightening or under-tightening.
- If unsure, consult forums or experts who specialize in LS engine swaps; they often have specific bolt size charts.
- Keep your bolts organized and label them if you’re working on multiple vehicles or transmissions.
Getting the bellhousing bolt size right saved me a lot of headaches and ensured my LS engine and transmission were securely mated for many miles. I hope my guide helps you do the same!
Author Profile
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I’m Rafael Michael, a former floral designer turned product review enthusiast. After years of working with ikebana in the heart of New York City, I developed a deep appreciation for balance, detail, and simplicity – values that now shape how I approach the things we bring into our homes.
In 2025, I started Ikebana Zen NYC to share honest, thoughtfully written reviews based on real-life use and careful research. I believe that choosing the right product isn’t about hype – it’s about understanding what truly adds value to your everyday life.
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