i was browsing through the afr website, checkin out the 165's and 185's just to satisfy my want for more power and saw that both series will not accept Rail Rocker Arms... correct me if i'm wrong, but thats what they used before roller rocker arms, right? and thats what my engine is, right? so does this mean i cant get the afr-165s i was planning on getting sometime in the future? thanks, and if so, id have to buy a roller cam motor, wouldnt I? any good quality heads that will work with my setup? gt40s maybe? thanks again