Page 386 of High Performance Parts for American V-Twins 2008 by S&S Cycle

valve train camshafts s&s® camshafts s&s camshafts and other related valve train parts go through extensive testing on the dyno on the track and many miles on the street but before these products are put into an engine cams and other components are tested using sophisticated computer simulation programs the use of these high-tech tools allows us to develop cams that are optimized for our engines and kits s&s also does real world testing with specialized devices such as our spintron® machine to validate our designs before we start production although s&s offers a number of bolt-in cams for various applications many s&s cams are high lift types and require appropriate spring spacing or special high lift springs for proper operation s&s offers high lift spring kits that make high performance cam installation simple this year s&s introduces the new sidewinder® valve springs that provide high rpm capability with reduced spring force see s&s valve springs starting on page 9-38 of this catalog notes the installation of high lift cams may require additional clearancing between pistons and valves intake and exhaust valves rocker arms and spring collars and rocker arms and rocker covers in addition spring spacing must be verified to eliminate coil bind s&s recommends that all of these areas be checked and clearanced per any instructions included with parts purchased s&s valve spring kits for harley-davidson® evolution® and twin cam 88® engines are designed to be used with the shoulderless style valve guides these shoulderless style guides can be retrofitted to early stock evolution big twin engines equipped with shoulder style valve guides in order to gain the greatest benefit from a high performance camshaft it is advisable to upgrade the fuel and exhaust system to allow the engine to achieve its full potential see hot set up kits® in section 3 of this catalog for more information want more power the camshaft is only one piece of the performance puzzle s&s cams carbs cylinder heads and exhaust work together to help any engine achieve its full potential see section 3 of this catalog for hot set up kits® starting on page 3-3 hot set up kits are proven combinations of components so you can t go wrong the spintron® tester allows s&s technicians to simulate high rpm conditions to evaluate the performance of valve train components under test using high speed video laser positioning devices and audio measurements 9-1 visit us at www.sscycle.com

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