A gas delivery assembly for uniform gas flow within a processing system is provided. In one aspect, a gas delivery assembly includes sidewalls at least partially disposed about a gas delivery component disposed within the processing system. The gas delivery shield also includes a bottom wall having a varied profile that extends beyond the gas delivery component to define a varied spacing above the substrate. The bottom wall of the gas delivery also includes a plurality of gas passageways formed therethrough to deliver a uniform gas distribution to a substrate being processed.