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585C Chain Drive Camshaft KitDesigned for 88" to 107" engines with compression ratios from 10.0:0 to 10.5:1 and 100" and 107" engines with compression ratios 9.7:1 to 10.5:1 Strongest from 3500-6000 rpm for 88" to 103" engines and 2500-5000 rpm for larger engines Made in the USA Installer must check coil bind, valve to valve clearance and valve to piston clearance. Cams for '06 Dyna and '07-'17 Twin Cam are for use with models with hydraulic tensioner chain drive system.