Description
The Rocker Box Performance Kit from Cycle Solutions delivers a complete valvetrain upgrade for 1999–2017 Harley-Davidson Twin Cam engines. Riders choose this kit when they want increased durability, reduced flex, and reliable performance under demanding conditions. As a result, it works equally well for aggressive street riding and performance engine builds.
This kit combines premium components that strengthen the rocker box assembly and improve long-term reliability. Most importantly, each part plays a specific role in supporting higher spring pressures and high-lift camshafts.
What’s Included in the Rocker Box Performance Kit
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CSR Billet Rocker Arm Supports
CNC-machined from high-strength 7075 aluminum to reduce flex and maintain accurate valve motion. -
CSR Billet Crankcase Breathers
Improve crankcase ventilation while helping manage oil pressure more efficiently. -
S&S Forged Roller Rocker Arms (900-4065A)
Forged steel construction with precision roller tips that reduce friction and improve valve control. -
Feuling Gorilla Rocker Shafts & Bolt Kit
Gas-nitrided shafts that handle extreme loads from performance cam and spring combinations.
Because these components work together, the valvetrain operates more smoothly and consistently. In comparison, stock rocker box parts can flex under higher RPM and increased spring pressure. Therefore, upgrading to billet supports and reinforced rocker shafts helps protect your engine and extend component life.
Key Benefits of This Performance Kit
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Improves valvetrain stability at higher RPM
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Reduces rocker arm flex under heavy loads
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Supports high-lift camshafts and stronger valve springs
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Enhances oil control and crankcase ventilation
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Uses proven components trusted by professional builders
Additionally, the S&S forged roller rockers deliver smoother valve actuation and improved lubrication. Not only does this reduce wear, but it also promotes consistent performance over time. Finally, the Feuling Gorilla rocker shafts add the strength needed for demanding riding and performance applications.
In summary, this Rocker Box Performance Kit provides a balanced combination of strength, reliability, and performance. Whether you ride your Twin Cam daily or push it harder with performance upgrades, this kit delivers confidence where it matters most.
⚠️ Fitment Note:
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Fits 1999–2017 Harley-Davidson Twin Cam models only
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Does not fit Milwaukee-Eight engines
