I got an e-mail from Jeff at MCH. He said he flowed a set of MP heads and that they didn't flow as well as the Stage III heads. I remember Dvorak bitching about them several years ago because the ports were smaller as cast than the original heads. Good for SS guys that port them anyway, not good for a stocker guy like Dan. I bet Dan has some flow numbers. Maybe you can call him or visit his website. Dvorak Machine.