The mancini rocker made by HS is not bushed and is not the same body as the standard HS roller rocker - I bought a set for the street car to replace some 440 source roller rockeres I had - The mancini set is good quality but definaetly not as beefy as the regualr HS rocker and I did have to order new pushrods as mine were just about .040 short going from the source rocker.