What matters in automotive parts is not a single dimension but the same dimension repeating on every part. From die design and draft angles to flow simulation and cooling channel layout, every decision serves that repeatability.
Engine and powertrain housings are driven by leak tightness; chassis and suspension parts by the integrity of load bearing sections. Electric vehicle components add heat dissipation to the list: in battery and power electronics housings, moving heat away from the part is solved by the geometry itself.
After casting, parts move through machining, surface treatment and inspection; critical sections and mounting holes are verified with measuring fixtures.