Rocker Arms for Heavy-Duty Trucks & Equipment

Rocker arms are the precision link in your engine’s valvetrain that transfer camshaft motion to the intake and exhaust valves. At Custom Truck One Source, our selection of heavy-duty rocker arms is engineered to deliver reliable performance in high-load, high-cycle truck and equipment applications — built for durability, precision and long service life.

Why a Quality Rocker Arm Matters

In heavy-duty truck and equipment engines, rocker arms play a critical role in valve actuation and combustion efficiency. A properly designed rocker arm ensures accurate valve timing, minimal friction, and consistent sealing of the combustion chamber. Poor or worn rocker arms can lead to valve train noise, reduced power, erratic operation and costly downtime. High-quality rocker arms are manufactured from premium materials, built for harsh environments and designed for heavy duty use.

How to Choose the Right Rocker Arm for Your Application

When selecting rocker arms for your truck or heavy-equipment engine, consider these key factors:

• Engine model & OEM specification: Match the rocker arm to your engine block, head design, cylinder count and manufacturer specification for correct fitment.

• Material & construction quality: Choose rocker arms made from hardened steel, alloy or high-performance materials designed for long life, low wear and high stress.

• Valve train compatibility: Ensure the rocker arm works with your lifters, pushrods, rockers assembly (if applicable), and that it matches your valve lift/duration profile and clearances.

• Duty-cycle and environment: For trucks in towing, heavy haul, off-road or multi-shift service, select rocker arms rated for high cycles, high heat and heavy load.
  If you’re unsure which rocker arm fits your application, our parts specialists are ready to help with fitment, cross-referencing and specification matching.

Maintenance Tips & Replacement Indicators

To maintain engine valvetrain reliability and avoid unexpected failures:

• Listen for clicking or ticking noises from the valve cover area — these may signal rocker arm wear, pivot looseness or incorrect clearance.

• Inspect valve train during scheduled maintenance: check rocker arm contact, pivot condition, lubricated surfaces, and wear patterns.

• When replacing rocker arms, consider related components (pushrods, lifters, valve springs) to ensure the entire assembly is in spec.

• If you notice valve performance issues, uneven cylinder power, or increasing valve train noise, inspect the rocker arms as part of your diagnosis.

Why Choose Custom Truck One Source

• We provide a comprehensive inventory of heavy-duty truck and equipment engine parts — including rocker arms and full valvetrain assemblies — from trusted manufacturers.

• Our nationwide distribution network ensures fast shipping and minimized downtime for your fleet or equipment.

• Our parts experts have deep knowledge of heavy-duty truck applications, engine models and duty-cycle requirements to help you select the correct rocker arm.

• Competitive pricing, robust inventory, and online filtering tools help you find the right part quickly and confidently.

Browse & Order Today

Explore our full selection of heavy-duty rocker arms — filter by engine model, part number, material, duty rating or valvetrain application. Place your order online or call our parts team at 877-831-0572 for technical assistance and fitment verification.