Cam Chain TensionerFor use in stock 07-17 Twin Cam engines or 99-06 Twin Cam engines with a hydraulic upgrade cam plate like the S&S TC3bodies machined from 6061 aluminum Larger diameter piston and tighter tolerance fit of the shoe in the body provide improved stability, no more rocking shoes Thicker pad for longer wear between service Replaceable shoes fit S&S tensioners only Chain oiling feature; provides oil to the chain rails right before crossing the tensioner for increased lubrication and greater cooling Made in the U.S.A.