What is the primary benefit of using roller rocker arms over stock stamped steel rockers?

Roller rocker arms, like these Edelbrock units, reduce friction in the valve train due to the roller tip and bearing fulcrum. This leads to smoother operation, less wear on components, and can contribute to improved engine performance and efficiency.

Are the necessary adjustment components included with this set?

Yes, this set includes thick-walled adjusting nuts and 4140 steel poly locks. These components are essential for properly setting valve lash and ensuring the rocker arms remain securely in place during operation.

What is the significance of the 1.7:1 ratio on these rocker arms?

The 1.7:1 ratio means that for every 1 unit of movement at the rocker arm's pivot point, the valve opens 1.7 units. This effectively increases valve lift and duration compared to a stock 1.5:1 ratio, which can help your engine breathe better and produce more power.

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Specifications

Brand: Edelbrock
Part #: 77790
UPC: 85347777907

Edelbrock Rocker Arms Roller BBC 7/16In 1 7 1 Ratio Set of 16

Name: Edelbrock Rocker Arms Roller BBC 7/16In 1 7 1 Ratio Set of 16
Brand: Edelbrock
SKU: edelbrock-edelbrock-rocker-arms-roller-bbc-7-16in-1-7-1-ratio-set-of-16-t14-128142
Price: 808.40 USD
Availability: BackOrder

$808.40

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Edelbrock Roller Rocker Arms for Big-Block Chevy and W-Series 348/409 engines. Features a 1.7:1 ratio and 7/16" stud compatibility for improved valve train operation.

Key Features

Fits Chevrolet W-Series 348 (5.7L) and 409 (6.7L) engines.
Designed for Big-Block Chevy applications using 7/16 inch studs.
Features a 1.7:1 ratio to increase valve lift and duration.
Manufactured in the USA from lightweight 7129 grade aluminum.
Body is CNC machined, micro-polished, and anodized for durability.
Includes a Torrington needle bearing fulcrum and roller tip for smooth operation.

This rocker arm set is designed for Chevrolet W-Series 348 (5.7L) and 409 (6.7L) engines, as well as Big-Block Chevy applications using 7/16 inch studs.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

If you're building or rebuilding a Big-Block Chevy or a W-Series 348/409 engine, these Edelbrock Red Roller Rocker Arms are a solid choice for your valve train. Designed to work with 7/16 inch studs, this set of 16 rockers features a 1.7:1 ratio, which helps to increase valve lift and duration for improved engine performance.

These rocker arms are manufactured in the USA from lightweight 7129 grade aluminum, keeping rotational mass down. The bodies are CNC machined for precision, then micro-polished and anodized to help resist wear and corrosion. For smooth operation and reduced friction, they incorporate a centerless ground trunnion race, roller pin, and roller tip, along with a high-quality Torrington needle bearing fulcrum. The full body design is built to accommodate springs up to 1.65 inches in diameter, and they come complete with thick-walled adjusting nuts and 4140 steel poly locks for secure adjustment.

This set includes everything you need for a complete valve train upgrade on your V8 engine. The attention to detail in their construction, from the materials used to the precision machining and finishing, means you're getting a well-built component designed for reliable performance.