How many rocker arm shafts do I need for my engine?

You will need four rocker arm shafts per motor. It's always a good idea to have spares or confirm your exact requirement before ordering.

What is the main benefit of replacing stock rocker arm shafts?

Replacing worn or broken stock shafts with these S&S Performance shafts helps restore proper valvetrain function. This ensures consistent valve operation and can improve overall engine performance.

Are these shafts compatible with aftermarket S&S engines?

Yes, these rocker arm shafts are designed to fit S&S V-Series, SB-Series, and T-Series engines in addition to various Harley-Davidson Big Twin and XL models.

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Trusted Since 1957

Est. 1957

Specifications

Brand: S&S Cycle
Part #: 90-4006
UPC: 90-4006

S&S Cycle 84-99 BT Rocker Arm Shaft

Name: S&S Cycle 84-99 BT Rocker Arm Shaft
Brand: S&S Cycle
Price: 17.13 USD
Availability: InStock

$17.13

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.

S&S Cycle rocker arm shaft for 1986-later XL and 1984-2017 Big Twin engines. Replaces worn stock shafts for improved engine performance.

Key Features

Fits 1986-later XL models, 1984-2017 Big Twins, and S&S V-Series, SB-Series and T-Series engines.
Four rocker arm shafts are required per motor.
Designed to replace worn or broken stock rocker arm shafts.
Proven S&S Performance construction.

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Will this fit your vehicle?

Product Details

These S&S Cycle rocker arm shafts are built to replace worn or broken stock shafts in a variety of Harley-Davidson and S&S engines. They fit 1986-later XL models, 1984-2017 Big Twins, and S&S V-Series, SB-Series, and T-Series engines. You'll need four of these per motor, so be sure to grab enough for your rebuild or repair.

S&S Cycle has a long history of making performance parts for V-twin engines, and these rocker arm shafts are a solid option for anyone looking to restore or improve their engine's valvetrain. They are designed to be a direct replacement for the stock parts, making installation straightforward if you're already inside the engine.