With a main journal diameter of 3.25-inches, the forged 4340-steel crankshaft from Eagle is a direct replacement for the stock nodular-iron unit. It boasts 0.040-inch more stroke length than stock. Eagle’s ESP Armor finishing process provides the brilliant appearance. Designed to shed oil and remove surface imperfections, ESP Armor doesn’t increase journal sizing but can be removed with polishing or machining, so be sure your machinist is familiar with it. Eagle is so confident that the finish improves crankshaft durability, the company warrants any such 4340-forging against failure for one full year regardless of application or usage.