Racing engines use forged steel crankshafts. OEM crankshafts are often investment castings. The simple truth is 2000 HP engines would not use investment casting in no way way, shape or form. Forgings are stronger no matter how you slice it. Same goes for forged race wheels and so on. Investment casting is a superior method over sand mold casting by far. However, it will never equal the strength of forged steel. We can argue the subject all year but the simple truth is forging yields a stronger product. If Nascar engine crankshafts were made of investment castings they wouldn't make it two laps. They would snap like a twig. They will take high RPM's for very short spurts but won't hold up to sustained high RPM over a long period of time.