Camshafts and Compression

The only 'problem' with Rhoads lifters is the perception that they will restore duration & lift as rpm increases because the lifters have less time to bleed down. The problem is that the groove down the side of the inner piston that promotes low speed bleed down....is still there bleeding down the lifter at higher rpms. Depending on many variables such as internal lifter clearances, oil viscosity, spring pressure, rocker ratio etc, the full lift & duration might NEVER be restored. With some combos, this might be a HP benefit, others a HP loss.