Page 423 of High Performance Parts for American V-Twins 2008 by S&S Cycle

1958-2008 50th ann iversary s&s® high-performance valve spring kits s&s valve spring kits are designed to simplify high-lift cam installation and increase spring force to reduce the risk of valve float the design of s&s valve springs eliminate most of the complicated procedures and specialized tools required to prepare cylinder heads for high lift cams while confirming critical clearances remains the responsibility of the engine builder the majority of street cams will require no additional modification of the cylinder head when s&s valve spring kits are used in some instances s&s valve spring kits serve as excellent replacements in stock rebuild applications all kits include detailed instructions notes high-lift cams may require the engine builder to obtain additional clearance between the piston and valves the intake and exhaust valves and the upper spring collar and rocker cover clearance should also be checked between the rocker arm and valve spring collar as well as between the rocker arm and rocker cover it is imperative that the engine builder confirm these clearances and check for spring coil bind even when using parts specifically designed for high-performance most valve train failures can be traced to over-revving or failure to confirm correct clearances during assembly for special valve springs for racing and extreme duty applications refer to the s&s race performance guide s&s sidewindertm valve springs s&s offers new valve springs for 1984 04 big twins 1986 03 harley-davidson® sportster® and 1991 02 buell® models these springs are lighter and simpler than our previous valve springs in that they only have one coil which is progressively wound from special ovate spring wire s&s sidewinder springs can offer high rpm capability with less spring pressure because they do not add as much mass to the valve train as multi-coil spring packs less mass means that the valve train does not take as much of a beating at high rpm since the valve springs do not have to exert as much force in order to control the valves lower spring force results in reduced valve train noise increased valve stability and longer valve train component life sidewinder valve springs are presently available for up to .585 lift camshafts s&s sidewinder spring kits fit stock cylinder heads for 1984 04 big twins and 1986 03 sportster and 1991 02 buell® models with no special machining the .585 lift springs are set up at 1.800 installed height and yield a seat force of 125 lbs this seat pressure is somewhat lower than our multiple coil valve springs but the reduced mass of the spring pack makes it possible for these valve springs to operate at rpm s that are just as high or higher than our older designs the .585 lift springs have been successfully tested to 6500 rpm 90-2069 pictured s&s pn 90-2069 ­ s&s .585 sidewinder® valve spring kit is ideal for stock rebuilds and for mild performance cams up to .585 lift s&s sidewinder valve spring kit for 1984 04 big twins 1986 03 sportster and 1991 02 buell models .585 lift msrp $99.95 90-2069 kit contents s&s sidewinder valve springs are available in kits of four valve springs with four top collars four bottom collars eight valve keepers and eight valve spring shims four each of .015 and .030 s&s® sidewinder® valve springs specifications lift .585 installed height 1.800 seat force 125 lb force max lift 332 lb max rpm 6500 order toll free 866-244-2673 9-38

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