Prevents starvation in high lateral forces, better scavenging, cooler oil without the aid of a cooler, individual feed lines can be setup with different pressures in mind(eg piston squirters or valve spring spray bars) and the crankcase is in vacuum instead of pressurized so that you won't find yourself having blow-by issues(eliminates pcv valve). The best part is a lower center of gravity because you are able to lower the motor.