A dual body rocker arm for a valve train assembly of an internal combustion engine includes: an outer body having a protrusion; an inner body connected to the outer body and arranged for pivotal movement relative to the outer body about an axis between a first position and a second position; and a torsional biasing element supported by the protrusion and arranged to bias the inner body relative to the outer body towards one of the first position and the second position. The protrusion is formed integrally with the outer body.