The valve pushrod exhaust of a Citroën DS is a crucial component of the valve mechanism. This robust rod is used to operate the pushrods, which in turn control the exhaust valves, essential for expelling burnt gases. The rod ensures precise timing and movement of the valves as dictated by the camshaft. This part is a vital link in the smooth and efficient operation of the legendary Citroën DS engine, and its replacement upon wear is essential to maintain optimal engine performance and longevity.