S&S CYCLE Roller Rocker Arms 900-4320A

Stock rocker arms limit your engine's potential, introducing flex and wear under high RPM stress. S&S Cycle's roller rocker arms deliver superior load distribution and durability through a .750" bushing design—50% larger than stock—engineered to handle forced induction and aggressive cam profiles. Built from 4140 forged steel and heat-treated for maximum strength, these arms maintain precise valve timing and reduce parasitic losses across the entire rev range.

The 1.5:1 rocker ratio is optimized for Shovelhead engines, and the pushrod oiling design simplifies maintenance when paired with S&S tappet guides. Whether you're running a stock or billet rocker box, these U.S.-made arms are a straightforward bolt-on upgrade that transforms reliability and performance.

• 4140 forged steel construction
• Heat-treated for strength
• .750" bushing design
• 50% more load surface
• Roller arm configuration
• 1.5:1 rocker ratio
• Pushrod oil delivery capable
• Shovelhead-style compatible
• Stock/billet rocker box compatible
• Includes four arms total
• Two front, two rear
• Bolt-on installation
• Minor clearancing may apply
• Made in U.S.A.
• MPN: 900-4320A