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SKU:
ZZ3H00549
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Single LS1 Rocker Arm with Upgraded Trunnion Installed 4.8 5.3 5.7 6.0 Trunion
$40.79
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$40.79
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Compatible Models
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Compatible equipment / model
Single LS1 Rocker Arm with Upgraded Trunnion Installed
This single LS1 rocker arm with an upgraded trunnion installed is a direct replacement component for GM LS series engines, serving the valvetrain in 4.8, 5.3, 5.7, and 6.0 liter platforms. The pre-installed upgraded trunnion improves stability and reduces the risk of needle bearing failure common in stock rocker arms. This rocker arm is designed for LS1, LS2, LS6, and other Gen III/IV small-block engines used in trucks, cars, and performance builds.
Overview
This single LS1 rocker arm with an upgraded trunnion installed provides a stronger, more reliable valvetrain component for GM LS engines. It replaces the factory rocker arm while the reinforced trunnion kit eliminates the weak point that often leads to premature wear. This rocker arm is suited for standard rebuilds, high-mileage repairs, or performance upgrades on 4.8L, 5.3L, 5.7L, and 6.0L engines.
Built For Performance
- Upgraded trunnion pre-installed for increased durability against roller bearing failure
- Precision-machined body ensures consistent rocker geometry and valve actuation
- Compatible with stock valve covers and factory valvetrain components
- Heat-treated steel construction for high-strength operation under load
- Drop-in replacement design requires no additional machining for most stock applications
Fits These Machines
- for GM LS1 engines
- for GM LS2 engines
- for GM LS6 engines
- for GM 4.8L truck engines
- for GM 5.3L truck engines
- for GM 6.0L truck engines
On-The-Job Use
- Direct replacement during LS engine rebuilds or top-end overhauls
- Used in performance builds to increase valvetrain reliability at higher RPM
- Common repair for ticking noise or wear symptoms in high-mileage LS engines
- Suitable for both street-driven vehicles and track-oriented setups
Specs At A Glance
| Type | Single Rocker Arm |
| Trunnion | Upgraded, Pre-Installed |
| Compatible Displacements | 4.8L / 5.3L / 5.7L / 6.0L |
| Engine Family | GM LS Series (LS1, LS2, LS6) |
Good To Know
Q: Why is an upgraded trunnion important in an LS rocker arm? A: The stock trunnion uses needle bearings that can fail under high spring pressure or high RPM, leading to catastrophic valvetrain damage. An upgraded trunnion with a solid bushing design offers greater load capacity and longevity, making it a popular reliability upgrade.
Q: Will this rocker arm fit my stock LS engine without modifications? A: Yes, this rocker arm is designed as a direct replacement for stock LS rocker arms, using the same mounting points and dimensions. However, always verify your specific engine's serial number and valvetrain configuration before installation to confirm compatibility.
Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.