Page 614 of High Performance Parts for American V-Twins 2008 by S&S Cycle

race components flywheels s&s® special flywheels for s&s cast pro stock engines special s&s pro stock flywheels are designed specifically for use with cast pro stock s&s crankcases in s&s 45° and 60° cast pro stock engines stroke is normally 4.375 for s&s 160 pro stock engines however any stroke may be specified between 3.500 and 5.000 although the very short strokes may not be possible with some configurations the special shape of the s&s pro stock flywheel results in increased rigidity and allows flywheels to be balanced to very large pistons and rods flywheel diameter may be specified between 7.875 and 8.125 note that larger diameters must be used for the longer strokes s&s pro stock style flywheels are pressed together type and feature a 1.500 pressed in crankpin 1.250 diameter big twin style pressed-in sprocket shaft and a special pressed-in pro stock pinion shaft pro stock pinion shaft is .850 longer than stock pinion shaft for a harley-davidson® sportster® model although the s&s pro stock flywheels are used in a s&s four-cam crankcase they are designed to use big twin width connecting rods connecting rods typically used for 45° pro stock applications are s&s 8.000 or 8.500 billet alloy rods 60° engines can use shorter connecting rods due to the wider cylinder angle s&s 7.500 billet aluminum rods are generally used however any big twin width connecting rod designed for a 1.500 crankpin may be used refer to current special order sheet for options available special order sheet required a special order sheet must be filled out before an order can be entered special order sheets will be mailed or faxed on request or they may be downloaded in pdf format from our website at www.sscycle.com click tech tip note flywheels with big twin sprocket shaft has a minimum flywheel diameter of 8 1/8 replacement flywheel assembly for s&s 45° 60° cast pro stock engines special order msrp $1,994.95 32-3003 act m historical fjob at wyman-gordon and the smithls yeovedeatheer ars rli ht severa e quit his they had boug in 1969 georg onsin on a farm flats ola wisc bonneville salt operation to vi return to the saw them er in wisconsin that first summ riley and warner 0 mile e prestigious 20 with leo payne in entry into th ga ers had 2.379 mph to piloting streamlin payne went 20 orcycle riders rtially leo mot ish this on a pa mber of other man to accompl hour club a nu per the first but payne was done it before nventional chassis with co lined motorcycle stream 16-29 visit us at www.sscycle.com

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