You are bidding on a set of RC engineering Pro stock camshafts for 1978-79 XS1100 These were installed but never run. They are hand made vintage drag bike parts ,made by Russ Collins Engineering They are stamped RC715 I did some research and they were made for pro stock racing. I do not have the specs,but I am sure the info is out there. These are like new and very rare. I dropped the price on these cams because I cannot find the specs on them,buy them as an unknown spec, and take your chances,the lobes look big.