Product Description
Michigan Motorsports LS1 Rocker Arm with Upgraded Trunnions Installed
Fits LS1 LS2 LS6 LR4 LM7 L59 LM4 L33 LQ4 LQ9 4.8L 5.3L 5.7L 6.0L Engines | Single Rocker Arm | Replaces GM 12681275 & 10214664
Upgrade your LS valvetrain one rocker at a time with the Michigan Motorsports LS1 Rocker Arm with Upgraded Trunnions Installed. This single direct replacement LS rocker arm is professionally upgraded with premium 8620 steel alloy trunnions and caged roller bearings to eliminate the weak factory-style needle bearing design that is known to fail and scatter debris through the engine. Designed to replace GM part numbers 12681275 and 10214664, this rocker arm is an excellent solution for replacing a damaged rocker, refreshing a high-mileage LS engine, or upgrading your valvetrain for better reliability in street, strip, boosted, and heads-and-cam applications. Built with the same style of upgraded rocker arms trusted in Michigan Motorsports’ high-horsepower turbo engine builds, this is a smart durability upgrade for LS owners who want strength, reliability, and confidence under the valve covers.
Key Features & Benefits
- Single Direct Replacement LS Rocker Arm: Designed to replace GM rocker arm part numbers 12681275 and 10214664 on compatible LS-based engines. This is ideal when you need to replace one damaged rocker arm or upgrade individual rockers during valvetrain service without purchasing a full set.
- Upgraded Trunnion Assembly Installed: This rocker arm comes professionally assembled with the trunnion upgrade already installed, saving you the time and hassle of pressing apart and rebuilding the rocker yourself. The ready-to-install design helps make valvetrain repairs faster, cleaner, and more reliable.
- Premium 8620 Steel Trunnion & Caged Roller Bearings: The upgraded trunnion uses durable 8620 steel alloy construction with caged roller bearings for improved strength and long-term reliability. This design provides a major upgrade over factory-style needle bearings that can wear, loosen, and fail under performance use.
- Helps Protect Your LS Engine: Factory LS rocker needle bearing failures can send small metal bearings through the engine, creating serious risk to the oiling system, bearings, and internal components. Upgrading to a captured bearing trunnion design helps reduce that failure risk and adds valuable protection to your build.
- Street, Strip & Boosted Build Ready: Perfect for daily drivers, stock rebuilds, camshaft upgrades, cylinder head upgrades, turbo builds, and aggressive LS combinations. These are the same style rocker arms trusted in Michigan Motorsports’ 1,000 horsepower turbo motor builds, giving customers proven confidence in demanding applications.
Notes
- Brand: Michigan Motorsports
- Quantity: Single rocker arm with upgraded trunnion installed.
- Replaces GM Part Numbers: 12681275 and 10214664.
- Trunnion Material: Premium 8620 steel alloy.
- Bearing Style: Caged roller bearing trunnion upgrade installed.
- Recommended Use: Direct replacement rocker arm, LS valvetrain repair, trunnion upgrade, stock rebuilds, heads-and-cam combinations, boosted builds, and high-performance LS applications.
Key Fitments
- LS1 engine applications
- LS2 engine applications
- LS6 engine applications
- LR4 engine applications
- Vortec 5300 applications
- LM7 engine applications
- L59 engine applications
- LM4 engine applications
- L33 engine applications
- LQ4 engine applications
- LQ9 engine applications
- 4.8L LS-based engines
- 5.3L LS-based engines
- 5.7L LS-based engines
- 6.0L LS-based engines
- Fitment note: Designed for compatible LS cathedral port rocker arm applications. Verify cylinder head and rocker arm style before purchase.
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Product Reviews
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Rocker arms
These rocker arms shipped very fast! Fitment is perfect no damages or defects. 10/10 will buy again and continue to recommend Michigan Motorsports
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Rockers
Exactly as advertised and super fast delivery. These rockers came with new bolts which have an allen head design versus the stock rockers 8mm nut design.
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Ls Rocker Arm
Great upgrade to my rockers
