What is the purpose of a 1.6:1 ratio rocker arm?

A 1.6:1 ratio rocker arm multiplies the camshaft's lift. This means that for every amount of lift the camshaft lobe provides, the rocker arm will open the valve 1.6 times that amount, resulting in increased valve lift.

What material is this rocker arm made from?

This Edelbrock rocker arm is manufactured from lightweight 7129 grade aluminum. The body is CNC machined and micro polished, then anodized for added durability.

Does this rocker arm come with all the necessary hardware for installation?

This individual rocker arm includes thick-walled adjusting nuts and 4140 steel poly locks. You will need to ensure you have the correct 3/8 inch studs for your application.

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Specifications

Brand: Edelbrock
Part #: 77781
UPC: 85347777815

Edelbrock Rocker Arms Roller SBF 3/8In 1 6 1 Ratio Individual

Name: Edelbrock Rocker Arms Roller SBF 3/8In 1 6 1 Ratio Individual
Brand: Edelbrock
SKU: edelbrock-edelbrock-rocker-arms-roller-sbf-3-8in-1-6-1-ratio-individual-t14-128144
Price: 52.95 USD
Availability: BackOrder

$52.95

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Edelbrock Roller Rocker Arms for Ford 289-351W. Improves valve lift with a 1.6:1 ratio.

Key Features

Fits Ford Small-Block 289 (4.7L) and 351W (5.8L) engines.
Features a 1.6:1 ratio to increase valve lift.
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.
Full body design accommodates springs up to 1.65 inches in diameter.

This rocker arm is designed for Ford 289 (4.7L) and 351W (5.8L) small-block engines using 3/8 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 rebuilding the top end of your Ford small-block engine, like a 289 or 351 Windsor, upgrading your rocker arms can make a notable difference in valve lift and performance. This individual roller rocker arm from Edelbrock is designed to help you achieve that improved lift with its 1.6:1 ratio.

Manufactured in the USA from lightweight 7129 grade aluminum, this rocker arm is built for durability. The body undergoes CNC machining and micro-polishing before being anodized, and the trunnion race, roller pin, and roller tip are centerless ground for smooth, consistent operation. It features a Torrington needle bearing fulcrum and a roller tip to reduce friction, and its full body design can accommodate springs up to 1.65 inches in diameter. It also includes thick-walled adjusting nuts and 4140 steel poly locks for secure adjustment.

This is a single replacement rocker arm, so be sure to order the correct quantity for your engine build. It's designed to work with 3/8 inch studs.