Thanks jimmy six #35. This is really good stuff. I don't have any GMC high lift rockers at the moment but I do have a 235 Chevy set I can check. In one of the early McGurk books on modifying GMC & Chevy sixes he claimed that the intake rockers were interchangeable between the two series of engines. Of course the Chevy is much heavier than the Jimmy so I can see no advantage is using Chevy rockers in a 270/302.
