What is the ratio of this rocker arm assembly?

This S&S Cycle rocker arm assembly features a 1.625 to 1 ratio. This means that for every 1 unit of movement of the pushrod, the rocker arm moves the valve 1.625 units.

What is included with this rocker arm assembly?

This product is a rocker arm assembly. It includes the necessary components for the rocker arm function as a set. Please refer to the product listing for a complete list of included parts.

What is the benefit of a 1.625:1 ratio rocker arm?

A higher ratio rocker arm, like the 1.625:1 found here, generally increases valve lift and can alter valve timing. This can lead to improved engine breathing and potentially better performance, especially in modified engines.

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Trusted Since 1957

Est. 1957

S&S Cycle 1984+ BT 1.625 To 1 Ration Rocker Arm Assembly

Specifications

Brand: S&S Cycle
Part #: 900-4119FA
UPC: 900-4119FA

S&S Cycle 1984+ BT 1.625 To 1 Ration Rocker Arm Assembly

Name: S&S Cycle 1984+ BT 1.625 To 1 Ration Rocker Arm Assembly
Brand: S&S Cycle
Price: 85.84 USD
Availability: InStock

$85.84

On Backorder — Expected to ship by May 7, 2026

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

Key Features

Fits 1984 and later Big Twin Harley-Davidson models.
Features a 1.625 to 1 rocker arm ratio.
Designed for improved valve lift and timing.
Well-built by S&S Cycle, a popular name in performance parts.

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Will this fit your vehicle?

Product Details

This rocker arm assembly from S&S Cycle is designed for 1984 and later Big Twin Harley-Davidson engines. It features a 1.625 to 1 ratio, which can help improve valve lift and timing compared to stock components. This assembly is a well-built option for riders looking to enhance their engine's performance.

S&S Cycle has been a well-known name in performance Harley-Davidson parts for a long time. This rocker arm assembly is built to handle the demands of modified engines, offering a solid improvement over worn-out stock parts. The 1.625:1 ratio is a popular choice for many Big Twin builds, providing a noticeable change in how the engine breathes and performs.

This part fits a wide range of Harley-Davidson Big Twin models from 1984 through 2016, including popular bikes like the Road King, Electra Glide, and Street Glide. If you're working on the top end of your Big Twin, this rocker arm assembly is a strong option to consider.