About Our Rocker Arms

Rocker arms are a key component of the engine’s valvetrain, responsible for transferring motion from the camshaft to the intake and exhaust valves. As the camshaft rotates, the rocker arms pivot to open and close the valves at precise intervals, allowing air and fuel into the engine while expelling exhaust gases. 

The design and construction of rocker arms play a major role in engine performance and durability. High-performance rocker arms are engineered to reduce friction, improve valve control, and maintain accurate valve timing under demanding conditions. Roller rocker arms, in particular, use needle bearings or roller tips to minimize friction and wear, helping improve efficiency and extend component life.

Rocker arm ratio is another important factor, as it determines how much the valve opens relative to camshaft lift. Higher ratios (such as 1.6 or 1.7) can increase valve lift and airflow, leading to potential horsepower gains when matched with the proper camshaft and engine setup.

Common designs include stamped steel rocker arms for stock applications and aluminum or stainless steel roller rockers for performance builds. Upgrading to performance rocker arms can improve valvetrain stability, reduce wear, and support higher RPM operation.

Whether you're rebuilding an engine or upgrading for performance, choosing the right rocker arms helps ensure accurate valve operation, improved airflow, and long-term reliability.

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Rocker Arms FAQs

What do upgraded rocker arms do?

Upgraded rocker arms can improve valve control, reduce friction, and increase durability. This helps support higher RPM operation and improves overall engine efficiency, especially in performance applications.

Do rocker arms increase horsepower?

Rocker arms can contribute to horsepower gains by improving valve lift and efficiency, especially when paired with a performance camshaft. Higher ratio rocker arms can increase valve lift, allowing more air and fuel into the engine.

What is rocker arm ratio?

Rocker arm ratio refers to how much the valve opens compared to the camshaft lobe movement. For example, a 1.6:1 ratio means the valve opens 1.6 times the camshaft lift. Higher ratios can increase valve lift and performance.

How do I choose the right rocker arms?

Choosing the right rocker arms depends on your engine type, camshaft, and performance goals. Factors such as rocker arm ratio, material, and compatibility with your valvetrain setup should all be considered.

Are roller rocker arms better than stamped rocker arms?

Roller rocker arms reduce friction and provide more precise valve control compared to stamped rocker arms. They are typically preferred for performance and high-RPM applications due to their durability and efficiency.

Do I need to upgrade rocker arms with a camshaft?

Upgrading rocker arms is often recommended when installing a performance camshaft. Stronger, more precise rocker arms help handle increased lift and stress while ensuring reliable operation.

Will rocker arms affect engine reliability?

Yes, high-quality rocker arms can improve reliability by maintaining proper valve motion and reducing wear. Poor-quality or worn rocker arms can lead to valve train issues and reduced engine performance.