Designed for 95” or larger engines with compression ratios between 10.0 and 10.75:1. 3000-6000 rpm.
Quick installation and Easy Start® Cams allow stock starter to start any engine.
Kit contains cams, gearcover gasket, cam bearings, and instructions.
Note: These cams are not bolt in and will need special valve springs.
If OES, 509 or 510C cams are used with the stock chain drive system in Twin
Cam 88® engines, it is recommended to use cylinder heads with stock valve
springs or performance valve springs with no more than 160 lb. of seat force.
For more demanding applications, we recommend the S&S gear drive cams.
When using 1999-'06 chain drive cams for lifts over .510", S&S strongly
recommends that the stock chain drive be upgraded to the S&S gear drive
or to the H-D® #25284-08 or #25284-11 hybrid plate. This kit updates the
problematic spring loaded chain tensioners to reliable hydraulic tensioners
and also upgrades the oil pump.
551 cams are not recommended with compression ratio of 10:1 or higher.
S&S can do a special order cam. Contact your S&S Customer Service Representative
for more information.
Not legal for sale or use on CA or EPA pollution controlled motorcycles.