Cylinders fit to pistons; no machining required. All parts required to upgrade to gear drive cam or hydraulic tensioners in one easy to order part number. NOTE: Not for use with S&S 79cc heads.The item "S&S Chain Drive Black 110 Big Bore Power Package Kit 2007-2017 Harley Twin Cam" is in sale since Tuesday, November 12, 2019. This item is in the category "eBay Motors\Parts & Accessories\Motorcycle Parts\Engines & Engine Parts\Big Bore & Top End Kits". The seller is "getlowered" and is located in Erlanger, Kentucky. This item can be shipped to United States, Philippines, Cayman islands, Canada.