Cams for 00-06 Twin Cam are for use with stock splined drive gears; for installation on 99 Twin Cam motors you must purchase splined outer drive sprocket; S&S recommends that Andrews 4340 steel drive sprocket PART #DS-199175 be usedCams for 06 Dyna and 07-12 Twin Cam are for use with models with hydraulic tensioner chain-drive system; cams 510C and 551C are bolt-in applications, all others require high-lift valve springsMade in the U.S.A.NOTE: Installer must check coil bind, valve-to-valve clearance and valve-to-piston clearance.509 GRIND CAMSBolt-in touring cams for 88" engines with stock compression rationGreat low and midrange torqueLower lift allows them to be bolted into stock 99-06 engines with stock valve springs180 psi cranking compression; no need for compression releases510 GRIND CAMSDesigned as bolt-in cam for 88", 95", 96" and 103" engines with compression ratios below 9.7:1Intended primarily for stock heads that have not been portedBolt-in cam, used with stock pushrods, springs and lifters551 GRIND CAMSDesigned as bolt-in cam for stock touring bikesMore power across the rpm range, with improved low and midrange torqueCan be used with stock pushrods, springs and lifters99-04 models require high lift springs570 GRIND CAMSDesigned for 88" to 103" engines with compression ratios between 9:1 and 10:199-04 models require high lift springs583 GRIND CAMSGreat overall cam for Softail and DynaProvides strong low-end torque and horsepowerStrongest from 1500-5000 rpm99-04 models require high lift springs585 GRIND CAMSDesigned for 88" to 107" engines with compression ratios from 10 to 10.5:1 and 100" and 107" engines with ratios 9.7:1 to 10.5:199-04 models require high lift springs625 GRIND CAMSFor 95" or larger engines with compression ratios between 10.0 and 10.75:1High lift springs required
