S&S Cycle S&S Standard Forged Rocker Arms for Harley Davidson 1984-2013 Big Twin, 1986-20 Manufacturer Part No : 900-4119A Economical solution for stock rebuilds and mild performance upgrades Forged from 8620 steel, heat-treated and then shot peened for additional strength and protection from fatigue Features the same .750in. long rocker shaft bushings as S&amp;S roller rockers Longer bushings provides 50% more load bearing area than the .500in. long bushings used in stock and other aftermarket rocker arms