S&S® Roller Rocker Arms for 1966-’84 Shovelheads The S&S® roller rocker arms for Shovelheads borrow some features of the S&S® Evolution/Twin Cam style rocker arms. Like the S&S® Evo style rockers, the S&S® Shovel style rocker arms are machined from 4140 steel forgings and heat treated for maximum strength. The forgings are designed to eliminate stress points and provide the strongest, most durable rocker arm possible. S&S® Shovelhead style roller rocker arms also feature the exclusive .750” long S&S® rocker arm bushings. The S&S® bushings provide 50% more load bearing surface than stock .500” bushings. The final Evo-like feature is an oil passage from the pushrod cup of the rocker arm to the inside of the rocker arm body that allows top end oiling through the pushrods when used in conjunction with S&S® tappet guides and pushrods. Oiling can also be done through the stock Shovelhead oiling system. S&S® Shovelhead style rocker arms have a nominal rocker ratio of 1.5:1, and high precision CNC machining insures that this ratio will be consistent in all parts. Our experience has shown that the actual rocker ratio of stock and aftermarket Shovelhead style rocker arms can vary widely. Some are less than the nominal stock 1.43:1 ratio and some are more. The roller tip reduces valve tip wear and side loading of the valve stem in high lift applications. S&S® Shovelhead style roller rocker arms are compatible with stock and S&S® billet Shovelhead style rocker boxes. Some clearancing may be required when using stock rocker boxes. S&S® Shovelhead Style Rocker Arms Set - Includes two each front and rear rocker arms 50-904320 Rocker Arm 50-904321 Front exhaust or rear intake 50-904322 Rear exhaust or front intake S&S® Forged Rocker Arms and Rocker Shafts 1984-Present V2 Big Twins Our forged steel roller rocker arms were designed for superior strength and to eliminate the failure-prone stress areas found in some other rockers. S&S® roller rockers are forged from 4140 steel, heat-treated, and then shot-peened for additional strength and protection from fatigue. Our rockers also utilize 3/4” long bronze bushings, compared to the more common 1/2” long bushings or needle bearings, and feature a modified lubrication system with unrestricted roller oiling. The end result is what we believe to be the finest rocker arm available anywhere, for any price. Roller Rocker Arm Set Includes: 2 each front and rear rocker arms. 50-904065 84-Up Big Twins Individual 50-4065F Front exhaust or rear intake 50-4065R Rear exhaust or front intake Rebuild Kits for S&S® Rocker Arms 50-904104 Current S&S® forged rocker arms S&S® Standard Forged Rocker Arms If you are looking for something better than stock Evolution style rocker arms, but you’re application does not warrant the expense of roller rockers, this is it! S&S® now offers an economical solution for stock rebuilds, and mild performance upgrades. S&S® standard rocker arms are forged from 4140 steel for greater strength than stock or cast steel rocker arms. In addition they feature the same .750” long rocker shaft bushings as our S&S® roller rockers do. The longer bushing provides 50% more load bearing area than the .500” long bushings used in stock and other aftermarket rocker arms. The valve contact tips are induction hardened for extended durability. Thousands of hours of engine testing have proved them to be superior to any non-roller rocker arm on the market. Recommended for cams of .585” lift or less. S&S® Standard Rocker Arms for Evolution Style Engines Includes: 2 each front and rear rocker arms. 50-904119 84-Up Big Twins Individual 50-904120 Front exhaust or rear intake 50-904121 Rear exhaust or front intake S&S® Roller Rocker Arms for Shovelhead Style Engines • Forged from 4140 steel heat treated and shot peened for maximum strength. • Roller tip reduces side thrusting on valve stem in high lift applications .750” long bushings provide 50% more load bearing area than stock style rocker arms. • Can be oiled through pushrods when used with S&S® Shovelhead style tappet guides and pushrods. • 1.5:1 rocker ratio. • Compatible with stock or S&S® billet rockerboxes. Bushings Current S&S® forged rocker arms, .750” long 50-904014 Rocker Arm Shafts 50-904006 Each (HD#17611-83) 50-4036 Includes 4 each 50-904006 NOTES: • 3/4” long bushings provide 50% more bushing support area than 1/2” long bushings. They eliminate the risk of engine damage associated with failed needle bearings. • Adjustable pushrods must be used with S&S® roller rocker arms to obtain proper valve clearance. • New rocker arm shafts are recommended for maximum performance and rocker life. Rocker Arm Shafts 50-904006 Each (HD#17611-83) 50-4036 Includes 4 each 50-904006 198 For pricing, visit www.motovan.com in the dealer section.
2013 RI Cruiser
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