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Cycle Solutions Rocker Box Performance Kit for 1999–2017 Harley Twin Cam engine components on white/transparent background
Rocker Box Performance Kit for 1999-2017 Harley Twin Cam Models - Image 2
Rocker Box Performance Kit for 1999-2017 Harley Twin Cam Models - Image 3

Rocker Box Performance Kit for 1999-2017 Harley Twin Cam Models

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Original price was: $1,159.00.Current price is: $1,099.00.

 

Get the kit that the professionals use. This is the part combination that Cycle Solutions Inc. installs when doing a Rocker Box Performance upgrade. Kit is for 1999-2017 Harley Twin Cam Models. Does not fit Milwaukee Eight Models
Kit Includes:

  • CSR Billet Rocker Arm Supports
  • CSR Billet Crankcase Breathers
  • S&S Rocker Arm Shaft Set 90-4036
  • S&S Forged Roller Rocker Arm Kit 900-4065A

Add a gasket kit and Feuling ARP fasteners for absolute confidence in your rocker box upgrade.

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Description

Rocker Box Performance Kit for 1999–2017 Harley-Davidson Twin Cam Models

This Rocker Box Performance Kit delivers a complete, performance-ready solution for Twin Cam engines. Designed for strength and reliability, it replaces factory components with precision-machined upgrades that support high-lift cams and heavier valve springs.

CSR Billet Rocker Arm Supports

  • Machined from 7075 billet aluminum for maximum strength

  • Eliminate flex commonly caused by factory cast parts, especially when using high-lift cams and stronger valve springs

  • Maintain proper valve-train geometry under high load and aggressive riding conditions

  • Install as a direct replacement for factory rocker arm supports

  • Manufactured in the USA to Cycle Solutions specifications

As a result, these billet supports provide increased durability and long-term reliability in both performance and high-mileage engines.

CSR Billet Crankcase Breathers

  • Machined from billet aluminum for reduced weight and increased strength

  • Use an updated umbrella valve design to instantly and accurately release crankcase pressure

  • Prevent outside air from being pulled back into the engine during operation

  • Provide a lighter and stronger alternative to stock steel crankcase breathers

Consequently, the improved breather design helps maintain consistent engine performance and efficient crankcase ventilation.

S&S Forged Roller Rocker Arm Kit (900-4065A)

  • Constructed from forged 4140 steel, then heat-treated and shot-peened for added strength and protection

  • Feature 3/4-inch long bushings instead of the shorter 1/2-inch bushings used in many other rocker arms

  • Improve load distribution and extend service life under high-performance conditions

  • Include a modified lubrication system that provides unrestricted oil flow to the rollers

  • Require adjustable pushrods, which are sold separately

  • Manufactured in the USA by S&S Cycle

Because of this design, these rocker arms deliver smooth operation, improved oiling, and increased durability in performance builds.

S&S Rocker Arm Shaft Set (90-4036)

  • Includes a set of four rocker shafts

  • Serve as the ideal replacement for OEM rocker shafts

  • Recommended when installing roller rocker arms to ensure proper fitment and reliability

  • Manufactured in the USA to meet high performance standards

Overall Performance Benefits

  • Increased valve-train stability under high load

  • Reduced flex and wear compared to factory components

  • Improved durability for performance and long-term engine builds

  • High-quality components designed and manufactured in the USA

Overall, this Rocker Box Performance Kit provides a proven combination of strength, precision, and performance. Whether you are upgrading a worn top end or supporting a high-performance Twin Cam build, this kit delivers reliable results built for real-world riding demands.

 

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