Designed as a bolt-in cam for 88, 95, and 96 CID engines with compression ratios below 9.7:1. It is primarily intended for use with stock, un-ported heads. The 510C chain drive camshafts for 1999-06 use the stock Harley-Davidson chain drive mechanism and. Offers an economical option for engines with mild performance upgrades. Great way to increase performance at an affordable price.Quick installation reuse many stock components. Can be used with stock valve springs. The item "S&S Cycle 510 Chain Drive Cams Camshaft Kit 1999-2006 Harley Davidson Twin Cam" is in sale since Friday, October 10, 2014. This item is in the category "eBay Motors\Parts & Accessories\Motorcycle Parts\Engines & Engine Parts\Other Engines & Engine Parts". The seller is "americanclassicmotors" and is located in Zieglerville, Pennsylvania. This item can be shipped worldwide.