Michigan Motorsports LS1 Rocker Arms with Upgraded Trunnions | Fits 1999-2013 4.8L 5.3L 5.7L Cathedral Port LS & 1999-2006 6.0L LS Engines | Complete Set of 16 Ready-to-Install Rockers
Condition: New
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30-day refund/replacement
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Availability:
In Stock.
Arrives
Friday, Aug 7
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Features
- 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.
Manufacturer: Michigan Motorsports
Brand: Michigan Motorsports
Model: LS1 Rocker Arm Kit
Item Weight: 8 pounds
Product Dimensions: 8 x 6 x 2 inches
Item model number: 25100
Is Discontinued By Manufacturer: No
Exterior: Machined
Manufacturer Part Number: 25100
Date First Available: August 20, 2015
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Friday, Aug 7
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Quality part everything looked and felt great.
Reviewed in the United States on January 7, 2026 by Michael Kline
Nice rocker arms. Work well.
Reviewed in the United States on November 16, 2025 by Steve
These are not OEM GM rocker arms, but they feel and look nearly identical, no issues in the casting whatsoever that I can see. These are insurance so if you have a rocker fail the needle bearings don't scatter into your motor like the factory rocker arms will.
Reviewed in the United States on April 10, 2025 by Joe B
10/10 recommend this for anyone rebuilding
Reviewed in the United States on June 15, 2026 Reviewed in the United States on June 15, 2026 by J’shon
Seems to be doing well I’ve have them in for a month now did the afm/dod delete ls7 lifters and cam tuned and been running this Silverado hard and not and issues so far
Reviewed in the United States on June 3, 2025 by Amazon Customer
Just installed and they are great so far. Very happy with my purchase. Can’t beat the price!
Reviewed in the United States on April 25, 2025 by Mckyla
Still on
Reviewed in the United States on November 18, 2024 by tony duenas
Michigan Motorsports makes products and USA owen and came a week before it said it would. I have bought many products but, I'm highly disappointed in shipping on these trunions they came in a bubble wrapped lined envelope what a joke. Box was beat to crap and crushed In luckily nothing was hurt. Quality is great just shipping on these is a joke. I don't mind paying more for shipping for better quality. Just do better already talked to their customer service they are great.
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Reviewed in the United States on April 19, 2025 by Isaiah W.