The venerable Chevy small-block 350 remains a favorite for enthusiasts, and for good reason. Its robust design and widespread availability make it an ideal platform for modification. One popular upgrade that significantly boosts performance is the installation of roller rockers. But choosing the right set requires understanding several key factors. This guide will delve into the world of Chevy 350 roller rockers, helping you make an informed decision for your engine build.
Understanding the Benefits of Roller Rockers
Before we jump into specifics, let's understand why roller rockers are a popular upgrade. Compared to traditional stamped or fulcrum rockers, roller rockers offer several advantages:
-
Reduced Friction: The primary benefit is reduced friction. Roller rockers use a roller bearing contact point between the rocker arm and the valve stem. This significantly reduces friction compared to the sliding contact of a stamped rocker, leading to increased valve lift and improved engine breathing.
-
Increased Lifespan: Less friction translates to less wear and tear on both the rocker arms and the valve train components. This extends the lifespan of your engine components and reduces the need for frequent maintenance.
-
Higher RPM Performance: Roller rockers are particularly beneficial at higher engine speeds. The reduced friction allows the valves to open and close more efficiently, maximizing power output in the upper RPM range.
-
Improved Valve Train Stability: The precise design and roller bearing contribute to improved valve train stability, reducing the chances of valve float at high RPMs.
Choosing the Right Roller Rockers for Your Chevy 350
Selecting the appropriate roller rockers involves considering several critical factors:
1. Ratio:
The rocker arm ratio determines how much valve lift is achieved for a given camshaft lift. Common ratios for Chevy 350 applications range from 1.5:1 to 1.7:1. A higher ratio (e.g., 1.7:1) provides more valve lift, increasing airflow and power, but it also requires a more aggressive camshaft. Choosing the right ratio depends heavily on your engine's overall specifications and intended use.
2. Material:
Roller rockers are typically made from steel or aluminum. Steel rockers are generally more durable and better suited for high-performance applications, while aluminum rockers are lighter, which can reduce valvetrain inertia. The choice depends on your budget and the level of performance you are aiming for.
3. Stud Mount vs. Shaft Mount:
Chevy 350 engines can utilize either stud-mounted or shaft-mounted roller rockers. Stud-mounted rockers are individually mounted to the cylinder head, offering greater adjustability and potentially improved precision. Shaft-mounted rockers are mounted on a common shaft, which simplifies installation but may limit adjustability. The best choice depends on your preference and specific engine setup.
4. Adjustability:
Adjustable roller rockers allow for precise valve lash adjustment, crucial for optimal engine performance. Non-adjustable rockers simplify installation but require pre-set valve lash from the manufacturer, potentially limiting fine-tuning options.
Installation Considerations
Installing roller rockers is a more involved process than simply swapping out stock rockers. It requires careful attention to detail, including:
-
Correct valve lash adjustment: Precise adjustment is critical to prevent valve train noise and ensure proper engine operation.
-
Proper rocker arm geometry: Ensuring correct geometry prevents excessive wear and tear on the valvetrain components.
-
Pushrod length: This must be checked and potentially adjusted to match the new rocker arm ratio and camshaft.
Conclusion
Upgrading your Chevy 350 with roller rockers can significantly enhance performance. However, careful consideration of the factors discussed above is crucial to ensure a successful and beneficial upgrade. Remember to consult reputable sources and potentially seek professional assistance for installation, especially if you lack experience with engine building. With the right choice and careful installation, you can unlock significant performance gains from your Chevy 350 engine.
