Product Description
Michigan Motorsports LS1 Rocker Arms with Upgraded Trunnion Bearings Installed
Fits 1999-2013 4.8L 5.3L 5.7L Cathedral Port LS Engines & 1999-2006 6.0L LS Engines | Complete Set of 16
Upgrade your LS valvetrain with Michigan Motorsports LS1 Rocker Arms with upgraded trunnion bearings already installed. This complete set of 16 LS rocker arms is professionally assembled with premium trunnion bearing upgrades to improve durability, reduce friction, and eliminate the weak point commonly found in factory-style LS rocker arm needle bearing assemblies. Designed for 1999-2013 4.8L, 5.3L, and 5.7L cathedral port LS engines, as well as 1999-2006 6.0L LS engines, these rockers are a strong upgrade for stock rebuilds, heads-and-cam combinations, performance street cars, truck builds, and LS swap projects. Each rocker arm arrives ready to install with the trunnion upgrade already in place, saving time and giving your LS engine a more reliable valvetrain foundation.
Key Features & Benefits
- Upgraded Trunnion Bearings Installed: These LS1-style rocker arms come professionally assembled with the trunnion upgrade already installed, eliminating the extra work of pressing apart and rebuilding the rockers yourself. This gives builders a ready-to-install valvetrain upgrade that saves time and improves reliability.
- Replaces Failure-Prone Stock Needle Bearings: Factory LS rocker arms use cageless needle bearings that can fail and scatter metal debris through the engine. The upgraded trunnion setup helps address that common failure point, making this a smart preventative upgrade for both stock and performance LS engines.
- Premium Trunnion Upgrade Construction: Built with an 8620 steel alloy trunnion and caged roller bearings for improved strength, durability, and long-term service life. This upgraded design helps support smoother rocker arm movement and better valvetrain stability compared to worn or failure-prone factory bearing assemblies.
- Great for Stock Rebuilds & Performance Builds: Ideal for refreshing a factory LS engine, replacing worn rocker arms, or supporting aggressive camshaft and cylinder head upgrades. These rocker arms are a strong addition to heads-and-cam builds where valvetrain durability is a priority.
- Complete Set with Installation Hardware: Includes 16 LS series rocker arms with the roller bearing trunnion upgrade installed, plus 16 high-strength Allen head bolts for rocker arm installation. This gives you the complete rocker arm set needed for a full LS V8 valvetrain upgrade.
Why Upgrade?
- Prevents Common Rocker Bearing Failures: The upgraded trunnion bearing setup replaces the OEM cageless needle bearing design that can fail and send metal debris through the engine.
- Performance-Ready Valvetrain Support: This upgrade is strongly recommended for aggressive camshaft setups, cylinder head upgrades, higher RPM use, and LS engines that need improved valvetrain durability.
- Ready to Install: Rockers arrive fully assembled with the trunnion kit already installed, so there is no extra press work, bearing installation, or assembly required before installation.
Notes
- Brand: Michigan Motorsports
- Kit Includes: 16 LS series rocker arms with roller bearing trunnion upgrade installed and 16 high-strength Allen head bolts for rocker arm installation.
- Trunnion Upgrade: 8620 steel alloy trunnion with caged roller bearings.
- Cylinder Head Compatibility: Designed for cathedral port LS cylinder head applications.
- Important Fitment Note: Will not fit rectangle port LS3-style cylinder heads.
Key Fitments
- Engine Applications: 1999-2013 4.8L, 5.3L, and 5.7L cathedral port LS engines.
- 6.0L Applications: Fits 1999-2006 6.0L LS-based engines.
- LS Engine Codes: LS1, LS2, LS6, LR4, LM7, L59, LQ4, LQ9, LM4, L33, LS4, LY2, L20, LY5, LMG, LMF, LH6, LC9, LH8, LH9.
- Common Vortec Applications: LS1, LS2, LS6, LR4, Vortec 5300 LM7, L59, LM4, and L33 engines.
- Fitment note: Compatible with 4.8L, 5.3L, 5.7L, and 6.0L LS-based cathedral port engines; 6.0L fitment is limited to 1999-2006 applications.
- Will not fit rectangle port LS3-style cylinder heads.
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Product Reviews
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Rockers
Great rocker arm solution
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trunions
Looks great, ty !!
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Trunion rockers
Great quality rockers with the trunion upgrade, and at a great price.
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Rocker arms
10 outta 10 does exactly what I need them too
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Rocker kit
Look great and work great. Easy transaction. Will buy from again.
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Rocker arms
Very fast shipping, Very nice quality, will be my new go to for all of my engine building…
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Nice set of rockers
The rockers look like a very well built product.
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Great product
Great product quality
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LS1 upgraded rocker arms
The upgraded rocker arms will save you time and money. Buying the parts and installing new trunions is a time consuming job. It makes more sense to use new upgraded rocker arms rather than upgrading used rocker arms.
