you mean larger bore.. The stroke has nothing to do with the name. Calvin has stuff bigger then the DMX too.
A DM is not for everyone.. IMO.. it should only be used on the hill and track. Straight line only. Also.. the person should know his/her way around a banshee engine or have a competent mechanic near by that is familiar with the DM. Because when your pushing 130+hp stuff is going to break... its not a matter of if... its a matter of when..