I have used many of the 440 source parts, but not their rocker arms. They may be OK with a mild cam with low spring pressures, but with bigger cams / higher spring pressures I went with T&D rockers on the 500" stroker (0.714" lift solid roller, #700+ open spring pressure), and bronze bushed stainless steel rockers on the 505" stroker with a 0.614" lift hydraulic roller (about #380 open pressure.)