Michigan Motorsports LS1 Rocker Arms with Upgraded Trunnions | Pre-Assembled for GM LS Engines | Fits 4.8 5.3 5.7 6.0 LS2 LS6 LQ4 LQ9 LY5 LM7 L33 | Enhanced Durability and Performance
Condition: New
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Returnable until Jan 31, 2026
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
Availability:
In Stock.
Arrives
Wednesday, May 27
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Features
- Pre-Assembled LS1 Rocker Arms with Upgraded Trunnions: Fully assembled and ready to install, featuring high-performance trunnions for improved durability and smoother operation.
- Enhanced Valvetrain Stability: Upgraded trunnion bearings replace the factory needle bearings, providing greater strength and reduced failure risk under high-performance conditions.
- Direct Fit for GM LS Engines: Designed for 4.8L, 5.3L, 5.7L, 6.0L LS-based engines, including LS1, LS2, LS6, LQ4, LQ9, LY5, LM7, and L33, making them ideal for performance upgrades or OEM replacements.
- Improved High-RPM Performance: Upgraded trunnions allow for increased RPM potential and greater valvetrain control, making them a reliable choice for street, strip, and track applications.
- Designed for Long-Term Durability: Machined to OEM specifications with high-strength materials to withstand aggressive camshafts and high-lift applications, ensuring long-lasting performance.
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:
Wednesday, May 27
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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- Affirm Financing
- Afterpay Financing
- PayTomorrow Financing
- Financing through Apple Pay
Learn more about financing & leasing here.
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Top Amazon Reviews
Did a top end rebuild on my 03 tahoe. Chabge everything. These are a great choice as they come with the trunion upgrade installed already. With my tahoe having 250k miles. These were an easy choice
Reviewed in the United States on July 21, 2023 by Nicholas Covarrubias
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 Joseph B
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
Quick shipping! Haven’t installed parts yet, but just by inspecting them they seem like, quality parts.
Reviewed in the United States on July 12, 2024 by Chris
Seem to be well built
Reviewed in the United States on June 18, 2025 by Amazon Customer
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.
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