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All “ESPautomotive rods are manufactured from a two piece forging. The forging process forces the grain into the shape of a connecting rod resulting in a superior fatigue life. The rod cap is forged separately so that the grain runs perpendicular to the load forces which strengthens the rod. Many aftermarket rods are manufactured from 4340 steel. 4340 specs allow a range of different materials to achieve the desired results. Although it is a more expensive process all “ESP3-D rods also include higher content of nickel and chrome which increases the strength and fatigue life without making the rod brittle. Extensive testing has proven our two piece forging to be superior to any one piece forging on the market! “ESPH-beam connecting rods provide the strength and durability required in the most demanding engines at a sportsman rod price. Eagle was the first connecting rod to use the state of the art Sunnen Krossgrinding system to hold extremely tight tolerances. 7/16 Inch ARP bolts come standard unless otherwise noted. Although for extreme Horsepower applications.