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When installing pistons and connecting rods, this not only shows us what stroke does, but how it interacts with rod length and piston pin location. Rod length, when compared with stroke, is known as rod ratio. The longer the rod, the better the piston dwell time at each end of the bore as the crank comes around and acts on the rod and piston. Piston dwell time is important to how much air and fuel is delivered into the chamber and bore.