S&S Cycle Forged 8620 Steel Standard Rocker Arms for Harley-Davidson Big Twin Engines

S&S Cycle Forged 8620 Steel Standard Rocker Arms for Harley-Davidson Big Twin Engines

Rocker arms endure some of the most demanding loads in any reciprocating engine, and replacing worn stock arms with an engineered upgrade is one of the most effective steps in a Big Twin rebuild. These arms bring the durability of performance-grade engineering to stock-stroke and mild-cam applications, where long bearing life and reliable valve train operation matter most.

Key Features

• Economical solution for stock Big Twin rebuilds and mild performance upgrades
• Forged from 8620 steel for greater strength than stock or cast steel alternatives
• 0.750-inch long rocker shaft bushings provide 50% more load-bearing area than shorter designs
• Eliminates needle bearing failure risk associated with shorter bushing designs
• Valve contact tips induction hardened for extended durability
• Recommended for use with cams producing 0.585 inches of lift or less
• Sold as a set of four: two front arms and two rear arms
• Made in the USA

Technical Specifications

• Material: Forged 8620 steel
• Bushing Length: 0.750 inches (50% more load-bearing area than shorter designs)
• Valve Tip Treatment: Induction hardened
• Cam Lift Rating: 0.585 inches maximum
• Quantity: Set of four (two front, two rear)
• Origin: Made in the USA

Fitment Notes

• Recommended for cams with 0.585 inches of lift or less – not suitable for high-lift cam applications
• For Harley-Davidson Big Twin engines
• Review the Fitment tab for complete model and year compatibility