It's been a very long time since I even looked at a Crower cam or there parts. A member here, USCG Charger is selling his stuff and is using one. http://www.forabodiesonly.com/mopar/showthread.php?t=179422
After poking around, some, I noticed these rollers do not have advertised duration's, but the rest of the specs say one thing to me, "I ain't fooling around !" Check these out; http://www.crower.com/camshafts.html?cat=1687
