Yes, agreed. The OP mentioned the rollers he chose increased lift, i.e. had an increased ratio over stock (likely 1.60 vs 1.50 which is typical). I was wondering if the increased lift afforded by these particular rockers caused an interference issue.
S & S parts manual quotes roller rocker conversion increases ratio from standard 1.76 to 1.80.
Since all alternative S & S cams are non-interference with standard rockers, including the high performance 618 (0.618" lift) there would be some leeway with lower lift cams.
As an example the 569 cam (next one down in terms of lift and valve duration) would give 0.582" lift with roller conversion so would maintain non-interference.
