Use the search feature. Unfortunately, what you will find is postings, complete with pictures, in some cases, of failed rocker arms that broke. I think mad dog claimed they had gotten a bad batch of castings...but no one here trusts them any longer....so I would return them unless they did some fancy talking about changes they've made.
Contact HdWrench...real name Steve he is a forum sponsor, and has a business called
http://www.gmrperformance.com/ and from what I've heard, he sells a quality forged set of roller rockers at a comparable price to the cast mad dog units.