What is a connecting rod? A connecting rod is an engine component that transfers motion from the piston to the crankshaft and functions as a lever arm. Connecting rods are commonly made from cast aluminum alloy and are designed to withstand dynamic stresses from combustion and piston movement. H-Beam Connecting Rods are a little bit heavier, stiffer, more rigid and stronger than I-Beam, so they are the priority selection for high horsepower and high cylinder pressures. Maxpeedingrods H-Beam connecting rods with high precision CNC machined precision rod cap alignment dowels. Each rod is magnetic particle tested to ensure free of flaws. It has super high wear resistance and excellent durability.