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The rotating assembly consists of a crank and rod set from Eagle and JE pistons. The crank from Eagle is a forged 4340 chromoly-steel piece that has been finished with the company's ESP Armor process. There is a full write up on the ESP Armor process on Eagle's website if you want all the details, but the simplest way to describe it is the crank comes out with a mirror finish on all the bearing surfaces. Hooked to the 3.760 stroke crank is a set of Eagle I-beam rods that also feature the ESP Armor process.