Flat plane crank

They also require better harmonic dampening due to sinusoidal vibration compared to a conventional 90* crank. The reason flat plane crank engines typically do so well is because they spin high and through high flowing ports. The only domestic V8 I can think of that uses a 180* crank is the 5.2L Voodoo. And it does make 520 rated hp, but it also has 4 valve heads, and fuel doesn't shut off until 8200 rpm.