small block roller rocker and rolloer lifter will not work. the six rocker are on there on with 1.75 ratio regluar small block lifter will work. there is a few companys that make roller cam for six but they are hard to find not much call for them. do a web search and look for cam company online catlogs to see if you can find the roller cams. big block roller rocker will not work also. tried this one my self and they just dont fit. harland sharp does make roller rockers arms for inline sixes. and they are made in the USA.

super250six