Ever feel like your LS engine is holding back? Maybe you’ve noticed a little less power than you’d expect, or you’re just chasing that extra edge for your build. It’s a common feeling for many LS owners who want their engines to perform at their peak.
Choosing the right LS rocker trunion upgrade can be a real headache. There are so many different brands and types out there, and figuring out which one is best for your needs can feel like a puzzle. You worry about spending money on something that won’t make a difference, or worse, something that might cause problems later on. It’s a big decision for anyone looking to get more out of their engine.
But don’t worry! By the end of this post, you’ll understand exactly what a rocker trunion upgrade is, why it matters for your LS engine, and how to pick the perfect one. We’ll break down the jargon and make it easy to see the benefits. Let’s dive in and unlock your LS engine’s true potential!
Top Ls Rocker Trunion Upgrade Recommendations
- Complete Set of 16 Rocker Arms: Includes 16 LS series rocker arms with upgraded roller bearing trunnions already installed, giving builders a complete ready-to-install valvetrain upgrade for one LS V8 engine without needing to press apart and rebuild the rockers separately.
- Upgraded Trunnions Already Installed: Professionally assembled with premium trunnion bearing upgrades before shipment, saving install time while improving durability, reducing friction, and eliminating one of the most common weak points in factory-style LS rocker arm assemblies.
- 8620 Steel Trunnion with Caged Roller Bearings: Built with an 8620 steel alloy trunnion and caged roller bearings for improved strength, smoother rocker arm movement, and better valvetrain stability compared to worn or failure-prone factory needle bearing assemblies.
- Fits Cathedral Port LS Applications: Designed for 1999-2013 4.8L, 5.3L, and 5.7L cathedral port LS engines and 1999-2006 6.0L LS engines, including LS1, LS2, LS6, LR4, LM7, L59, LQ4, LQ9, LM4, L33, LY5, LMG, LH6, LC9, and related platforms.
- Ideal for Rebuilds and Performance Builds: A strong upgrade for stock refreshes, heads-and-cam builds, LS swaps, truck builds, and higher-RPM applications where improved rocker arm reliability, better bearing retention, and ready-to-install convenience matter.
- BTR Brian Tooley Racing V2 Premium LS Rocker Trunnion Kit
- Fits: LS1 LS2 LS3 LS6 L99 LS4 L99 LQ4 LQ9 L76 L92 LR4 LM7 L59 LM4 L33 L98 L77 LY6 LFA LZ1 LY2 L20 LMF LH6 LY5 LMG LC9 LH8 LS4 4.8 5.3 5.7 6.0 6.2
- The all new Trunnion Kit V2 features a Trunnion with pre-installed inner race bearings. The V1 kits have stood up to an enormous amount of abuse, but we decided to upgrade them to a pressed inner race comprised of 52100 Heat Treated Bearing Steel, over the more commonly used 8620 Carburized Steel found in our V1 kits and many OEM applications.
- Additionally, these feature a self oiling axle with priority feeding to the Trunnion itself.
- This Kit Includes: Brian Tooley Racing V2 Trunnions, Brian Tooley Racing Caged Roller Bearings, Brian Tooley Racing LS Trunnion Clips, LS Trunnion Install Washers
- High-Strength Construction: The Michigan Motorsports LS Rocker Arm Trunnion Kit is engineered with heavy-duty steel trunnions and high-load needle bearings, ensuring maximum durability and performance for your GM LS engine.
- Wide Compatibility: Designed to fit 4.8L, 5.3L, 5.7L, 6.0L, 6.2L, 7.0L, LS1, LS2, LS3, LS6, L99, LS4, LS7, LS9, LSA, LQ4, LQ9, L76, L92, LR4, LM7, L59, LM4 engines.
- Enhanced Valve Train Stability: This kit reduces valve train wear and prevents common factory rocker arm trunnion failures, making it ideal for high-RPM and aggressive camshaft applications.
- Easy Installation: The Michigan Motorsports LS Trunnion Kit includes all necessary hardware and detailed instructions, allowing for a straightforward installation that minimizes downtime.
- Improved Performance and Reliability: By reducing friction and increasing load capacity, this trunnion upgrade improves horsepower and torque output while ensuring consistent, long-lasting performance under extreme conditions.
- BTR Brian Tooley Racing V2 Premium LS Rocker Trunnion Kit
- Fits: LS1 LS2 LS3 LS6 L99 LS4 L99 LQ4 LQ9 L76 L92 LR4 LM7 L59 LM4 L33 L98 L77 LY6 LFA LZ1 LY2 L20 LMF LH6 LY5 LMG LC9 LH8 LS4 4.8 5.3 5.7 6.0 6.2
- The all new Trunnion Kit V2 features a Trunnion with pre-installed inner race bearings. The V1 kits have stood up to an enormous amount of abuse, but we decided to upgrade them to a pressed inner race comprised of 52100 Heat Treated Bearing Steel, over the more commonly used 8620 Carburized Steel found in our V1 kits and many OEM applications.
- Additionally, these feature a self oiling axle with priority feeding to the Trunnion itself.
- This Kit Includes: Brian Tooley Racing V2 Trunnions, Brian Tooley Racing Caged Roller Bearings, Brian Tooley Racing LS Trunnion Clips, LS Trunnion Install Washers & Brian Tooley Racing LS Rocker Arm Bolts Qty 16
- Pre-Assembled Rocker Arms with Enhanced Trunnions: Our kit features 16 fully assembled LS1 rocker arms, each upgraded with premium trunnions, ensuring a straightforward installation process and immediate performance benefits.
- Enhanced Valve Train Stability: By reinforcing rocker arm strength and reliability, our upgrade promotes smooth valve operation, maximizing engine performance and longevity, even in high-performance setups.
- Premium Construction: Each rocker arm incorporates a high-quality 8620 steel alloy trunnion and caged roller bearings, replacing the factory’s cageless needle bearings. This design ensures optimal load distribution and minimizes the risk of bearing failure, safeguarding your engine from potential damage.
- High-Performance Trunnion System: Equipped with robust trunnions and precision-engineered caged roller bearings, this system is built to endure high RPMs and aggressive cam profiles, providing exceptional durability under demanding conditions.
- Superior Durability and Reliability: The upgraded components address common failures associated with stock LS1 rocker arms, significantly reducing wear and enhancing overall engine longevity.
- Eliminates Factory Trunnion Failure Points: Replaces weak OEM needle bearings that are prone to failure with a captured bearing design, preventing loose needles from damaging your engine and significantly improving long-term reliability.
- Captured Bearing Upgrade Design: Features a full captured trunnion system that keeps all internal components securely in place, providing smoother operation and consistent performance under high RPM and heavy valvetrain loads.
- Built for Performance and High RPM Use: Designed to handle increased valve spring pressures and aggressive camshaft profiles, making it ideal for cammed engines, upgraded valvetrains, and performance-focused LS builds.
- Wide LS Engine Compatibility: Fits a broad range of LS engines including 4.8L, 5.3L, 5.7L, 6.0L, and 6.2L platforms such as LS1, LS2, LS3, LQ4, LM7, and LM4, making it a versatile upgrade for both car and truck applications.
- Cost-Effective Valvetrain Upgrade: Allows you to strengthen your factory rocker arms without the expense of full aftermarket rocker assemblies, delivering improved durability and performance at a fraction of the cost.
- Fits LS1 LS2 LS3 LS6 L99, LS4, LS7, LS9 LSA LQ4 LQ9 L76 L92 LR4 LM7 L59 LM4 4.8 5.3 5.7 6.0 6.2 7.0
- 16 x Rocker Arm Trunnions, 32 x Rocker Arm Bearings, 32 x Rocker Arm Retaining Rings, 16 x Bolts, 2 x Washers
- Increases stability and stiffness
- These LS Series retrofit trunion kits are designed to convert stock LS Series rocker arms into captured roller trunions for high-rpm race applications.
- These are more economical than new race rocker arms, and can handle much higher RPM than the factory ones.
- Trunnion Upgrade Installed for Maximum Strength: Forget needle bearing failure—these LS3 rocker arms come fully assembled with premium trunnions that are built to survive high-RPM abuse, big boost, and aggressive cam profiles.
- Engineered for LS3 6.0L & 6.2L Platforms: Compatible with GM’s most popular LS engines including L99, L76, L92, L96, LSA, LS9, LY6, and L77, these rockers are the go-to for serious performance upgrades across a wide range of LS builds.
- Ideal for Boosted, Cammed & High-Revving Builds: If you're running a turbo, blower, nitrous, or high-lift cam, these rockers deliver the stability and precision needed to keep your valvetrain locked in at full throttle.
- No Assembly Required – Bolt On & Go: Pre-assembled with upgraded trunnions so you can spend less time in the garage and more time tearing up the street or track. A true drop-in upgrade for the DIY or pro-level builder.
- Superior Oiling & Longevity Under Pressure: The upgraded design delivers better oil flow and bearing surface contact, reducing friction, cutting heat, and extending component life when things get hot under the hood.
Upgrade Your LS Engine: The Rocker Trunion Guide
Thinking about giving your LS engine a boost? A rocker trunion upgrade is a popular choice for many gearheads. This small but mighty part can make a big difference in your engine’s performance and longevity. This guide will help you understand what to look for and make the best choice for your build.
What is a Rocker Trunion Upgrade?
Before we dive in, let’s quickly explain what a rocker trunion upgrade is. In an LS engine, rocker arms help open and close your engine’s valves. They pivot on a trunion. Sometimes, the stock trunnions can wear out or fail, especially under high stress. A trunion upgrade replaces these with stronger, more durable parts. This helps your valvetrain run smoother and last longer.
Key Features to Look For
When you’re shopping for rocker trunion upgrades, keep these important features in mind:
- Material Strength: This is the most crucial feature. You want trunnions made from strong materials that can handle the intense forces inside your engine.
- Bearing Type: Some upgrades use needle bearings, while others use bushings. Both can work well, but needle bearings often offer smoother operation.
- Ease of Installation: While most upgrades are designed for direct fit, some might be a bit trickier to install. Look for kits that come with clear instructions and all the necessary hardware.
- Brand Reputation: Stick with well-known brands that have a good track record for quality and customer support.
Important Materials
The materials used in rocker trunion upgrades directly impact their strength and lifespan.
- Steel Alloys: High-quality steel alloys are common. They offer excellent strength and wear resistance. Look for terms like “chromoly” or “tool steel,” which indicate superior durability.
- Bronze Bushings: Some kits use bronze bushings. Bronze is a tough metal that can handle friction well. It’s a reliable choice for many applications.
- Needle Bearings: These tiny roller bearings are encased in a cage. They allow for very low friction and smooth rotation. They are a premium option for high-performance builds.
Factors That Improve or Reduce Quality
Several things can make a rocker trunion upgrade better or worse.
- Precision Machining: High-quality upgrades are precisely machined. This ensures a perfect fit and smooth operation. Sloppy machining can lead to premature wear.
- Heat Treatment: Proper heat treatment makes the metal harder and more resistant to wear and deformation. This is a sign of a well-made part.
- Lubrication: Good lubrication is essential for any moving engine part. Ensure the trunion upgrade is designed to work well with your engine’s oiling system.
- Cheap Materials: Using low-grade metals or poor manufacturing processes will definitely reduce the quality and lifespan of the trunion upgrade.
User Experience and Use Cases
Who benefits from a rocker trunion upgrade, and how do they use it?
- Performance Enthusiasts: If you push your LS engine hard, whether on the track or the street, a trunion upgrade is a smart preventative measure. It helps ensure your engine can handle the extra stress.
- Daily Drivers: Even for everyday driving, a trunion upgrade can offer peace of mind. It can prevent potential failures that could leave you stranded.
- Camshaft Upgrades: When you install a more aggressive camshaft, your valvetrain works harder. A trunion upgrade is often recommended to support these changes.
- High Mileage Engines: If your LS engine has a lot of miles on it, the stock trunnions might be showing signs of wear. An upgrade can restore reliability.
The user experience with a good rocker trunion upgrade is often one of increased confidence. You’ll notice smoother engine operation and less valvetrain noise. It’s a relatively inexpensive upgrade that can save you from much larger repair bills down the road.
Frequently Asked Questions (FAQ)
Q: Why should I upgrade my LS rocker trunnions?
A: You should upgrade to improve durability and prevent potential failure, especially if you have a high-performance engine or plan on making modifications.
Q: Are rocker trunion upgrades difficult to install?
A: Installation difficulty varies. Most are designed to be a direct replacement, but some kits might require more effort. Always check reviews and instructions.
Q: What is the difference between needle bearings and bushings in trunion upgrades?
A: Needle bearings use small rollers for very low friction and smooth operation. Bushings are solid sleeves that also offer good durability.
Q: Can I use a rocker trunion upgrade on a stock LS engine?
A: Yes, you can. It’s a good preventative upgrade even for stock engines, but it’s especially beneficial for modified ones.
Q: How much does a rocker trunion upgrade typically cost?
A: Prices can range from around $100 to $300 for a full set, depending on the brand and materials.
Q: What are the signs that my stock trunnions might be failing?
A: You might hear ticking or knocking noises from the valvetrain, or notice a loss of engine power.
Q: Do I need any special tools for installation?
A: Most installations require basic hand tools. Some kits might include a specialized tool for pressing in bearings or bushings.
Q: Will a rocker trunion upgrade improve my engine’s horsepower?
A: It won’t directly add horsepower, but it ensures your engine’s valvetrain functions optimally, which can indirectly support better performance.
Q: What is the lifespan of a good rocker trunion upgrade?
A: With proper installation and maintenance, high-quality trunion upgrades can last the lifetime of your engine.
Q: Where can I buy rocker trunion upgrades?
A: You can find them at automotive performance parts stores, online retailers, and directly from manufacturers.