---
product_id: 511980172
title: "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"
brand: "michigan motorsports"
price: "€ 592.85"
currency: EUR
in_stock: true
reviews_count: 5
category: "Michigan Motorsports"
url: https://www.desertcart.gr/products/511980172-michigan-motorsports-ls1-rocker-arms-with-upgraded-trunnions-pre-assembled
store_origin: GR
region: Greece
---

# Upgraded trunnion bearings for durability Optimized for high-RPM valvetrain control Pre-assembled for instant install 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

**Brand:** michigan motorsports
**Price:** € 592.85
**Availability:** ✅ In Stock

## Summary

> ⚡ Upgrade your LS valvetrain and leave stock performance in the dust!

## Quick Answers

- **What is this?** 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 by michigan motorsports
- **How much does it cost?** € 592.85 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/511980172-michigan-motorsports-ls1-rocker-arms-with-upgraded-trunnions-pre-assembled)

## Best For

- michigan motorsports enthusiasts

## Why This Product

- Trusted michigan motorsports brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **RPM Ready:** Enhanced valvetrain stability supports higher RPMs, perfect for street, strip, or track dominance.
- • **Built to Last:** Machined to OEM specs with high-strength materials to handle aggressive cams and long-term abuse.
- • **Bulletproof Bearings:** Upgraded trunnion bearings replace fragile needle bearings for unmatched durability under stress.
- • **Plug & Play Precision:** Pre-assembled LS1 rocker arms ready to bolt on and boost performance instantly.
- • **Engineered for Every LS:** Direct fit for a wide range of GM LS engines from 4.8L to 6.0L—versatility meets power.

## Overview

Michigan Motorsports’ LS1 Rocker Arms come pre-assembled with upgraded trunnion bearings, designed to fit a broad range of GM LS engines. Engineered for enhanced durability and high-RPM stability, these rocker arms deliver reliable, long-lasting performance for street and track applications.

## Description

Upgrade your GM LS engine’s valvetrain with these pre-assembled Michigan Motorsports LS1 Rocker Arms featuring upgraded trunnions, designed to enhance stability, durability, and performance. This kit provides fully assembled rocker arms with high-performance trunnion bearings, replacing the factory needle bearings for improved strength and reliability. Designed as a direct replacement for LS-based engines, these rocker arms fit 4.8L, 5.3L, 5.7L, 6.0L LS1, LS2, LS6, LQ4, LQ9, LY5, LM7, and L33 applications, making them an ideal upgrade for stock and high-performance builds. The upgraded trunnions enhance valvetrain stability and allow for increased RPM potential, ensuring smoother operation under high-lift camshaft conditions. Built for long-term durability, these rocker arms are precision-machined to OEM specifications, ensuring a perfect fit and reliable performance in LS-powered vehicles. Whether you're rebuilding an engine, upgrading your valvetrain, or replacing worn factory components, these pre-assembled LS1 rocker arms with upgraded trunnions offer a superior solution for strength and longevity. Upgrade your LS valvetrain with a proven high-performance rocker arm solution designed for street, strip, and high-performance applications.

Review: Excellent replacement part
Review: Upgraded Trunnions

## 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.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Michigan Motorsports |
| Brand | Michigan Motorsports |
| Model | LS1 Rocker Arm Kit |
| Product Dimensions | 20.32 x 15.24 x 5.08 cm; 3.63 kg |
| Item model number | 25100 |
| Exterior | Machined |
| Manufacturer Part Number | 25100 |
| Item Weight | 3.63 Kilograms |

## Images

![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 - Image 1](https://m.media-amazon.com/images/I/81cg-k8QuaL.jpg)

## Questions & Answers

**Q: Are these rocker arms compatible with an LS1 cam swap?**
A: YES! Michigan Motorsports LS1 Rocker Arms are specifically designed to handle aggressive camshaft profiles and high-performance cam swaps.

**Q: What engines are these rocker arms compatible with?**
A: These rocker arms are compatible with LS1, LS6, and other GM LS-based engines. Will not fit Rectangle Port/"LS3" Style Heads

**Q: Do these rocker arms come with a trunnion upgrade?**
A: Absolutely! These rocker arms feature upgraded trunnions with heavy-duty captured needle bearings for improved performance and durability.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Excellent replacement part
*by K***N on 14 August 2019*



### ⭐⭐⭐⭐⭐ Upgraded Trunnions
*by M***E on 7 January 2026*



### ⭐⭐⭐⭐⭐ Good stuff
*by S***E on 16 November 2025*



## Frequently Bought Together

- 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
- Michigan Motorsports Camshaft Thrust Retainer Plate LS Includes ARP Bolt Kit 134-1002 Gen III IV 4.8 5.3L 6.0L 6.2L LS LS1 LQ4 LQ9 LS2 LS3 Fits 12589016 Non-VVT

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*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-02-23*